spin a bifid a

Pathol.: Cleft spine; a congenital malformation of frequent occurrence, arising from arrest of development. It may be regarded as a hernia of the membranes of the spinal cord through a fi ure in the wall of the bony canal. The person affected may occasionally survive till middle life, but the disease usually terminates fatally. chin, bench; go, gem; thin, this; membrane called the pia mater , surrounded by a sheath formed by the dura mater. Between this and the pia mater is the arachnoid membrane and the cerebro-spinal fluid. It is subject to various diseases, as spinal con jest i on, hæmorrhage, irritation, meningitis, myelitis, paralysis, . spi-năx, s. [ Lat.spina =a spine.] Ichthy. & Palæont .: A genus of Spinacide (q.v.), with three small species from the Atlantic and southern extremity of America. Each dorsal with a spine; spiracles wide, superior, behind the eye. [SPINACIDE, 2.] spin-dle, *spin-el, spin-nel ( Prov .), *spindele, *spin-dell, s. [A. S. spinl , from spinnan = to spin; O. Dut. spille ; Dut. spil (for spinle); O. H. Ger. spinal a ; Ger. spille , spindel. The d is excrescent as in sound, thunder, .] I. Ordinary Language : 1. In the same sense as II. 6. "The enormous wheel that turns ten you sand spin- dles." Words worth: Excursion, vii. *2. A long slender stalk. "The spindles must be tied up, and, as they grow in height, rods set by them, lest by thir bending they should break."-Mortimer: Husbandry. 3. Any slender pointed rod which turns round, or on which anything turns; as (1) A shaft, as of a fusee; the axis of a capstan. (2) The rod which forms the axis of a vane. (3) A round connecting piece in a chair, as the vertical pieces uniting the seat and slat top. (4) The stem of a door-knob, which actuates the latch. *4. Something very thin and slender. "I am fall'n away to nothing, to a spindle." Beaum. & Flet.: Woman Pleas'd, iv. 3. II. Technically : 1. Build .: The same as NEWEL (q. v.). 2. Founding: The pin on which the pattern of a mold is formed. 3. Geom.: A solid generated by revolving a portion of a curve about a chord perpendicular to an sin, as; expect, Xenophon, exist. ph = f. The American Dictionary and Cyclopedia IMG:content-0040.png:[blocks in formation] IMG:content-0041.png:[blocks in formation] 1. Bot .: An indurated branch or proce formed of woody fiber and not falling off like a prickle from the part that bears it. Sometimes spines are trans- formed tendrils. Spines on the leaves are formed thorns and briars, wodny which case they project beyond the margin of the leaf, as in the holly, or they arise from a con- traction of the parenchyma of the leaves, as in the barberry. "Roses, their sharp spines being gone." Two Noble Kinsmen, i. 1. 2. Comparative Anatomy : (1) The vertebral column. [VERTEBRA.] "The spine , or back-bone, is a chain of joints of very wonderful construction." -Paley : Nat. Theology , ch. viii. (2) A slender, sharp or pointed proce , as the nasal spine, the neural-spine, . Called also a Spinous proce . (3) A stout, rigid, and pointed proce of the in- tegument, formed externally by the epidermis, and internally of a portion of the cutis. Sometimes used of stout, rigid, and pointed proce es of the epidermis only. 3. Mach .: A longitudinal ridge; a fin, spine-bearers, s . pl . [SPINIGERI.] family into five sub-families: Furnariinæ, Scleru- rinæ, Synalline (to which the name Spine-tails is sometimes confined), Philydorinæ, and Dendroco- laptine. spined, a . [Eng. spin(e); -ed.] Having spines; spiny; as, a spined caterpillar, spined cicadas. ( Swains on & Shuckard : Insects , p. 405.) spin-el (1), subst . [Gr. spinos, spinther =a spark ( King ); Lat. spinella ; Fr. spinelle ; Ger. spinel ; Ital. spinella .] Mineralogy : 1. The type species of a group of minerals called the Spinel Group, crystallizing in the isometric sys- tem, and being compounds of protoxides and ses- qui oxides with the typical formula ROR2O3. (1) Ruby or magnesia-spinel; with specific gravity 3-52- 3-58; (a) spinel-ruby, deep red; (b) balas-ruby, rose-red; (c) rubicelle, yellow or orange-red; (d) almandine, violet. (2) Ceylonite, or iron-magnesia spinel=pleonaste, con- taining much iron; color, dark green to black. (3) Magnesia-lime-spinel; color, green. (4) Chlorospinel; color, gra -green, with the iron con- stituent as sesquioxide. Found embedded in crystalline limestone, and a ociated with calcite in various rocks, also in the dolomitic agglomerate of Monte Somma. "A remarkably stout father, and three spinele sons." -Dickens: Uncommercial Traveler , iv. spin-ěll-āne, s. [ Eng.spinel ; suff. -ane ( Min .).] Min.: The same as NO SITE (q. v.). spin'-ěll-îne, s. [ Eng.spinel ; suff. -ine (Min.).] Min.: The same as SEME LINE (q. v.). spin-ěs'-çent, adj . [Lat. spines cens , pr. par. of spinesco to grow thorny; spina =a thorn.] Bot.: Tending to be spinous; somewhat spinous. spińk (2), s . [Dut. pinkster bloem , from pinkster Pentecost, at which the plant blooms.] Bot.: Cardamine pratensis . spin-na-ker, 8. [SPIN, v.] 2. A spinning-machine. 3. A garden-spider. "Weaving spiders, come not here: Hence, you long-legged spinners , hence!" Shakesp.: Midsummer Night's Dream, ii. 2. 4. A spinneret (q. v.). spin-ner-ět, s. [ Eng.spinner ; dim in. suff. -et .] Comparative Anatomy :