tapete (tapete)

[NL., tapet le (tap'et-les), a. [Appar. 6185 Tapeti (Lepus bras i liens is). may be an irreg. form The tapet le ramfeezl'd hizzie, She's saft at best, and something lazy. Burns , Second Epistle to J. Lapraik. tapetum (tā-pē'tum), n.; pl. tapeta (-tä). [NL., tapete , ML. tapetum , tappet1 .] 1. In bot . , the cell or layer of cells which is immediately outside an archesporium. It is disorganized and absorbed as the spores develop and mature. Also tapete . -2. The pigmentary layer of the retina; the tapetum nigrum.-3. The fibers from the corpus callosum forming a layer lining the roof of the middle and posterior cornua of the lateral ventricles. - Tapetum lucidum, the bright-colored light-reflecting membrane between the retina and the sclerotic coat of the eyeball: a modified choroid. - Tapetum nigrum, the pigmentary layer of the retina. See def. 2. tape-work (tap'werk), n. A kind of ornamental work consisting of knots, rosettes, etc., made of tape, and connected together by braid or cord, arranged in varied patterns and sewed strongly into a continuous texture, or else worked with the crochet-needle to form a back ground to the figures made by the tape. tapeworm (tap'wėrm), n. An entozoic parasitie worm, of flattened or tape-like form and indeterminate length, consisting of many sep tapir measly pork, or raw sausages made with such pork. The beef-tape is T. mediocanellata. The Egyptian or dwarf tape is T. nana; others are the elliptic-jointed, T. elliptic a; the crested, T. lophosoma; the spotted, T. flavopuncta. A dogtape is T. serrata; its larva, called Cysticercus pisiform is, is the pea-measle of the rabbit. Another dog-tape is T. cænur us, whose larva is the cystic worm ( Cænur us cerebra lis ) of the sheep's brain, producing the gid or staggers. A third dog-tape is T. echinococcus, whose larva, known as Echinococcus veterinorum, is a common hydatid sometimes found in man. T. margin at a of the dog is the tapeworm from the slender hydatid Cysticercus tenuicollis of the sheep. A cysticercus of the mouse becomes Tænia cras sicollis in the cat. Certain cysticerci of moles become in the fox Tænia tenuicollis and T. cra i ceps. The broad tapeworm of man is Bothriocephalus lat us, also called Swi tapeworm, and another human parasite of this genus is B. cord at us. Tapes are also called ribbon - worms. See cut under Cestoidea, also cænur us, cysticercus, echinococcus, hydatis, proglottis, scolex, deutoscolex, strobila. tapeworm-plant (tap'werm-plant), n. The cu o, Brayer a ( Hagenia ) anthelmintic a. tap-hole (tap'hol), n. In metal.: ( a ) A vertical slot cut through the dam and dam-plate of a blast-furnace. Through it the metal is tapped. During the working of the furnace the tap-hole is kept closed with a stopping of clay, which is removed by a pointed bar when the molten metal is ready to be drawn off. ( b ) In the puddling-furnace, a small hole through which the slag, technically termed tap - cinder, is let out, and which during the proce of puddling is stopped with sand. See diagram under puddling-furnace. (c) In a cementation-furnace, a small hole in one end of each pot, opposite to which is a hole in the furnace wall, used for the insertion of "trial" or "tap" bars, so placed as to be acce ible for ready withdrawal and inspection during the cementation proce . Also called testing - hole. (d) In general, any small hole in a furnace through which metal or slag, or both, are drawn at any stage in the proce . Also tapping -hole. tap-house (tap'hous), n. A drinking-house; a tavern. [Rare.] For mine own part, I never come into any room in a tap - house but I am drawn in. Shak . , M. for M., ii. 1. 219. IMG:content-2852.jpg:[graphic] mentary canal of most vertebrated animals. Such worms belong to the order Cestoidea or Tæniada, family Tæniidæ, and several different genera, especially Tӕ nia, the true tapeworms, and Bothriocephalus, the broad tapes. The so-called "head" of a tapeworm, small and inconspicuous in comparison with the great length to which the body may attain, is the whole of the real worm, all the rest of the joints being merely succes sive generative buds, which contain the matured sexual ele ments, and are technically called proglottides. They are continually budded off from the head, the oldest joint being the one furthest from the head; IMG:content-2853.png:[merged small][subsumed][ocr errors][ocr errors][ocr errors][merged small][subsumed][ocr errors][merged small][ocr errors][ocr errors][merged small] and any number of them may be broken off and expelled from the body without stopping their continual gemmation. This is why no tapeworm can be eradicated unle the head is expelled from the host. The chain of links or joints is the strobila; it may consist of several hundred generative buds, and grow to be several yards long. These formidable parasites are parenchymatous, having no mouth nor alimentary canal, and live sections, with intervening joints omitted. 1, head; 2, other end; a, several segments, enlarged; h, head, en larged. by absorbing nourishment from that intended to nourish the host, so that persons thus parasitized may suffer from defective nutrition while acquiring a ravenous appetite. The head of the tape is provided with hooks or suckers, or both, for adhering to the mucous membrane of the host. The ova, matured in every one of the joints, do not complete their development in the animal in which the adult exists. They require to be swallowed by some other vertebrate, the ripe proglottides being expelled from the bowel of the host with all their contained ova fertilized. The segments or proglottides decompose and liberate the ova, which are covered with a capsule. After being swallowed the capsule bursts, and an embryo, called a pro scolex, is liberated. This embryo, by means of spines, perforates the ti ues of some contiguous organ, or of a blood-ve el, in the latter case being carried by the blood to some solid part of the body, as the liver or brain, where it surrounds itself with a cyst, and develops a vesicle containing a fluid. It is now called a scolex or hydatid, and was formerly known as the cystic worm. The scolex is incapable of further development till swallowed and received a second time into the alimentary canal of a vertebrate. Here it becomes the head of the true tapeworm (see tænia - head ), from which proglottides are developed posteriorly by gemmation, and the adult animal with which the cycle began is thus reached. (See cut under tænia.) At least eight tapeworms, mostly of the genus Tænia, are found in man. The pork tape is T. solium, which in its cystic form (the so called Cysticercus cellulose ) in the pig produces the disease measles (see measles, 2); it is acquired by those who eat