Bipinnaria (bipinaria)

[NL., Stages of develop ment of a larval aste rid termed Bipinnaria. Upper figure, later Pluteus; lower, Bipartite Curve. y2= x ( x -1) (x - 2). earlier Echinopadium . IMG:content-2084.png:[blocks in formation] bipinnate, bipinnated (bi-pin'at, -a-ted), a. [ bi -2 + pinnate . Cf. bipennate.] Doubly pin- nate. (a) In bot . , applied to a pinnate leaf when its divi- sions are themselves again pin- nate. Also bipennate and bipen- nated. (b) In zoöl ., having op- posite pinnæ; feathered on two opposite sides of a main or axial line: in entom., specifically ap- plied to certain feathery forms of antenne. See antenna . (c) In an at ., having the fleshy fibers inserted on opposite sides of a tendinous intersection: said of a muscle. The rectus femoris muscle is an example. bipinnately (bi-pin'at-li), adv . In a bipinnate man- bipinnatifid, bipennatifid (bi-pi-, bi-pe-nat'i- fid), a. [ bi -2 + pinnatifid , pennatifid .] In bot . , doubly pinnatifid; having the primary and secondary divisions of the leaves pinnatifid. bipinnatiform (bi-pi-nat'i-fôrm), a . pinnate + -form.] Doubly pinnate in form; bipinnate: as, a bipinnatiform muscle. bipinnatipartite (bi-pi-nat-i-pär'tīt), a. [As bipinnate + L. part it us , divided: see partition .] Bipinnatifid, but having the divisions extend- ing to near the midrib. bipinnatisect, bipinnatisected (bi-pi-nat'i- sekt, -sek-ted), a. [As bipinnate + L. sect us , cut: see section .] In bot . , twice divided pin- IMG:content-2085.png:[blocks in formation] bipunctate (bī-pungk'tāt), a, [ punc- tate .] Having two punctures or spots. bipunctual (bi-pungk'tū-al), a. punctual, in the literal sense.] Having two points. Bipunctual coördinates. See coördinate. bipupillate (bī-pu'pi-lāt), a . [ bi -2 + pupil- late.] Having a double pupil: in entom . , said of an eye-like spot on the wing of a butterfly IMG:content-2086.png:[blocks in formation] biquadrate (bī-kwod'rāt), n. [ bi -2 + quad- rate.] Same as biquadratic . biquadratic (bī-kwod-rat'ik), a . and n. [ bi -2 + quadratic .] I. a. Containing or referring to a fourth power, or the square of a square; quartic. The word quartic has now completely super seded biquadratic , except in the following phrases. - Bi- quadratic equation, an equation with one unknown quantity the highest power of which contained in the equation is the fourth. Biquadratic equations are always susceptible of algebraic solution; equations of higher - Biquadratic function, involution. See the nouns. -Biquadratic parabola, in geom ., a curve line of the third order, having two infinite legs tending the same way.-Biquadratic root of a number, the square root of the square root of that number. Thus, the square root of 81 is 9, and the square root of 9 is 3, which is the bi- quadratic root of 81. North America, B. papyri fer a , is a large tree with a very tough, durable bark, which is largely used by the Indians in the manufacture of canoes and tents. The timber is valuable. The yellow or gray birch, B. lutea , is one of the most important deciduous trees of the northern At- lantic forests, growing to a very large size; its wood is heavy, very strong, and hard. The black, sweet, cherry-, bark, yielding a volatile oil identical with oil of winter. or mahogany-birch, B. lent a , has a very spicy, aromatic green, and its heavy, dark-colored wood is largely used for making furniture and in ship-building. Other prom i- Southern States, and the black birch, B. occidental is , of nent species are the red or river-birch, B. nigra , of the the Rocky Mountains and westward. Several shrubby species are widely distributed in mountainous and arctic regions, reaching a higher latitude than any other decidu- ous tree, as the alpine birch ( B. nana ), the low or dwarf birch ( B. pumila ), and the scrub birch ( B. glandulosa ). 2. A birch rod, or a number of birch-twigs bound together, sometimes used for punishing children. A birch-bark canoe. Lowell.- Jamaica or West Indian birch, or gumbo-limbo, a species of Bursera , B. gummifera , a small tree with ex- ceedingly soft, light, and spongy wood, yielding a kind of gum elemi, which is used as a remedy for gout and as the chief ingredient of a valuable varnish. birch (bérch), v. t. [ IMG:content-2087.png:[graphic] IMG:content-2088.png:[blocks in formation] biquartz (bi'kwartz), n. [ bi -2 + quartz .] A birch-tree, used for sweeping stables, streets, double quartz plate used in a form of sacchaetc. rimeter (which see). It consists of two semicircular birch-camphor (berch'kam for), n. A resin- plates of quartz joined in a vertical line; the two halves are so taken that they respectively deviate the plane of polarization of incident plane-polarized light through 90° in opposite directions. biquaternion (bi kwa-ter'ni-on), n. [ bi (see def.) + quaternion .] 1. In math ., an imaginary a + bi + cj + dk , where i , j , k are three mu- quaternion; a quantity expre ible in the form tually perpendicular vectors, and a, b, c, d are real or imaginary numbers. This is the sense in which Sir W. R. Hamilton used the word. He dist in- guished such a quantity from a real quaternion, because the whole algebraic procedure with imaginary quaternions is different from and more difficult than that with real belonging to different systems, so that their product van- ishes. biquintile (bī-kwin'til), n. [ quintile .] In astrol ., an aspect of the planets when they are distant from each other by twice the fifth part of a great circle, that is, 144° or twice 72°. biradiate, biradiated (bi-ra'di-at, -a-ted), a. [ bi -2 + radiate .] Having two rays: as, a bi- IMG:content-2089.png:[blocks in formation] biramous (bi-ra'mus), a. [L. bi- , two-, + ramus , a branch.] Po e ing or consisting of two branches; dividing into two branches, as the limbs of cirripeds. H. A. Nicholson . birch (bėrch), n . [= Sc. and North. E. birk , birch , birche, birke, byrce (= OHG. birch a , piricha , MHG. G. birke ), weak fem., parallel with berc , beorc (= MD. berck , D. berk ( berken - boom ) = Icel. björk (in comp. birk i- ) = Sw. björk = Dan. birk ), strong fem., = OBulg. breza = Ru . bereza = Lith. berzhas , birch, = Skt. bhūrja , a kind of birch. Root unknown; connected by some with AS. beorht, OHG. beraht , etc., bright, white, shin- ing, in allusion to the color of the bark. Not connected with L. betula , birch: see Betula .] 1. A tree or shrub belonging to the genus Be- tula (which see). The birches have smooth, lam i- nated outer bark and close-grained wood, which in some species is hard and tough, taking a fine polish, and is used in the manufacture of furniture and for many other pur- poses. The white, gray, or poplar birch, Betula alba , the principal European species, is a small tree, but is put to many uses, especially in the old world. The bark is used for tanning and thatching, and yields an oil which spruce-oil is also used for this purpose. The leaves, as is said to be used to give Ru ia leather its peculiar odor; [ bi -2 + well as the sap and oil, are used in the treatment of various chronic diseases, and the wood is used for fuel and many other purposes. Several varieties of this species, as cultivated for ornament. The canoe or paper-birch of the weeping, cut-leafed, and purple birches, are much bird1 (bérd), n. [ bird , berd , byrde , a me- tathesis of the usual form brid , bred , bryd , pl. briddes , a bird, also, as orig., the young of any as ), the young of any bird. Origin unknown; it bird, brid , pl. briddas (ONorth. bird- can hardly be connected with brood , as u stated. Po ibly the form bird is the more orig. form, standing for * byrd , boren , born, pp. of beran , bear; cf. byrde , (well-) born, ge- byrd , birth, of same origin: see birth1 . For the metathesis, cf. that of bird2 . For the devel- opment of sense, cf. the history of pullet and pigeon. The common Teut. word for 'bird' (def. 2) is fowl , now restricted in English: see fowl .] 1. The young of any fowl. Being fed by us, you used us so As that ungentle gull the cuckoo's bird Useth the sparrow. IMG:content-2090.png:[blocks in formation] Bird of Paradise ( Paradise a apod a). strengthened by the fact that the specimens which used to reach naturalists were without feet, these having been removed in preparing the skins. The packets of beautiful orange and yellow plumes worn as ornaments are from this species and a near relative, P. minor. P. sanguine a is a still more gorgeous bird. The king bird of paradise, Cincinnurus regius, is one of the most magnificent. Schle gelia wilson i, Diphyllodes speciosa, Parotia sex pennis, and Lophorhina atra are other leading species. The name is also given to a few species which are excluded from the technical definition of Paradiseidæ (which see). (b) In astron., a southern constellation. See Apus, 1. -Bird of pa age, a migratory bird; a migrant; a bird which regularly pa es in the spring from a warmer to a colder cli mate, and back in the fall. See migration and isepipteses. -Bird of peace, the dove, with reference to the story of Noah. Bird of prey, any member of the order Raptores or Accipitres, as the hawk, eagle, owl, etc. - Bird of the year, a bird le than a year old. - Bird of wonder, the phenix. - Birds of a feather, persons of similar tastes and habits: chiefly in the saying, "Birds of a feather flock together," indicating the usual a ociation with one an other of persons of like proclivities. - Early bird, an early riser; one who gets up betimes in the morning: in allusion to the proverb, "The early bird catches the worm."-Manof-war bird. Same as frigate - bird. Sea-cow bird, the treble-collared plover of Africa, Ægialites tri collar is: so called by Chapman, a traveler in southern Africa. To hear a bird sing, to receive private communication; be informed privately or secretly. IMG:content-2091.png:[blocks in formation] Mam. These day owls Sur . That are birding in men's purses. B. Jonson , Alchemist, v. 3. bird2+ (berd), n. [Sc. bird , burd , etc.; bird , berd , burd , byrd , etc., a transposition of the somewhat le common brid , bride , etc., 561 thets bright, comely, etc.: see bride1.] A maiden; a girl; a young woman. Ther nis no buyrde so briht in boure. That heo [she] ne schal fade as a flour. Early Eng . Poems (ed. Furnivall), p. 134. Hire cheere was simple, as birde in boure. Rom, of the Rose , 1. 1014. And by my word the bonnie bird In danger shall not tarry. Campbell , Lord Ullin's Daughter. [In this, as in other modern instances, the word is archaic, and is probably a ociated with bird1 as a term of endearment.]