| Thr | Symbol for threonine or its radical forms. (05 Mar 2000) |
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| thread | 1. A very small twist of flax, wool, cotton, silk, or other fibrous substance, drawn out to considerable length; a compound cord consisting of two or more single yarns doubled, or joined together, and twisted. 2. A filament, as of a flower, or of any fibrous substance, as of bark; also, a line of gold or silver. 3. The prominent part of the spiral of a screw or nut; the rib. See Screw. 4. Something continued in a long course or tenor; a,s the thread of life, or of a discourse. 5. Composition; quality; fineness. "A neat courtier, Of a most elegant thread." (B. Jonson) Air thread, the fine white filaments which are seen floating in the air in summer, the production of spiders; gossamer. Thread and thrum, the good and bad together. <zoology> Thread cell, the gizzard shad. See Gizzard. Thread lace, lace made of linen thread. Thread needle, a game in which children stand in a row, joining hands, and in which the outer one, still holding his neighbor, runs between the others; called also thread the needle. Origin: OE. Threed, red, AS. Rd; akin to D. Draad, G. Draht wire, thread, OHG. Drat, Icel. Rar a thread, Sw. Trad, Dan. Traad, and AS. Rawan to twist. See Throw, and cf. Third. Source: Websters Dictionary (01 Mar 1998) |
| threadfin | <zoology> Any one of several species of fishes belonging to Polynemus and allied genera. They have numerous long pectoral filaments. Source: Websters Dictionary (01 Mar 1998) |
| threadfish | <zoology> The cutlass fish. A carangoid fish (Caranx gallus, or C. Crinitus) having the anterior rays of the soft dorsal and anal fins prolonged in the form of long threads. Source: Websters Dictionary (01 Mar 1998) |
| threadworm | <biology, microbiology, zoology> Small nematode, Enterobius vermicularis, that is responsible for intestinal infection in humans. It appears as a small thread-like worm approximately 3-5mm in length. Common symptoms include anal itching that is worse at night when the female worm migrates to the anus to lay its eggs. Thin, white, thread-like worms may be visible at the anal opening or in the stools. The tape test can be performed by placing the sticky side of the tape across the anal opening for several seconds. The tape is then transferred to a glass slide where eggs may be seen through the microscope. (27 Sep 1997) |
| thready pulse | A small fine pulse, feeling like a small cord or thread under the finger. Synonym: pulsus filiformis. (05 Mar 2000) |
| threatened | A species likely to become endangered in the foreseeable future. (05 Dec 1998) |
| threatened abortion | <obstetrics> A clinical diagnosis that is made in females in the first trimester of pregnancy who present with vaginal bleeding and lower abdominal pain. This diagnosis can only be made after all other causes for these same symptoms have been excluded, through testing and physical examination. (27 Sep 1997) |
| threatened species | <biology, ecology, zoology> Any species which is likely to become an endangered species within the foreseeable future throughout all or a significant portion of its range. (09 Oct 1997) |
| threatened, endangered, and sensitive species | formal classifications of species. Sensitive Species for which population viability is a concern. Sensitive species are not federally designated under the Endangered Species act. The U.S. Fish and Wildlife Service, after study, makes the following designations (05 Dec 1998) |
| three | One more than two; two and one. "I offer thee three things." "Three solemn aisles approach the shrine." (Keble) Three is often joined with other words, forming compounds signifying divided into, composed of, or containing, three parts, portions, organs, or the like; as, three-branched, three-capsuled, three-celled, three-cleft, three-edged, three-foot, three-footed, three-forked, three-grained, three-headed, three-legged, three-mouthed, three-nooked, three-petaled, three-pronged, three-ribbed, three-seeded, three-stringed, three-toed, and the like. Origin: OE. Thre, threo, thri, AS. Thri, masc, threo, fem. And neut.; akin to OFries. Thre, OS. Thria, threa, D. Drie, G. Drei, OHG. Dri, Icel. Thrir, Dan. & Sw. Tre, Goth. Threis, Lith. Trys, Ir, Gael. & W. Tri, Russ. Tri, L. Tres, Gr. Trei^s, Skr. Tri. 301. Cf. 3d Drilling, Tern, Third, Thirteen, Thirty, Tierce, Trey, Tri-, Triad, Trinity, Tripod. 1. The number greater by a unit than two; three units or objects. 2. A symbol representing three units, as 3 or III. Rule of three. <mathematics> See Rule. Source: Websters Dictionary (01 Mar 1998) |
| three-body collisions | <radiobiology> It is possible (but generally rare) to have three particles collide simultaneously, instead of just two. (09 Oct 1997) |
| three-chambered heart | Congenital abnormality in which there may be a single atrium with two ventricles or a single ventricle with two atria. Rudimentary parts of the atrial and ventricular septa may be present but are incompetent to prevent a virtual single chamber in either case. (05 Mar 2000) |
| three-cornered | 1. Having three corners, or angles; as, a three-cornered hat. 2. <botany> Having three prominent longitudinal angles; as, a three-cornered stem. Source: Websters Dictionary (01 Mar 1998) |
| three-cornered bone | A bone on the medial (ulnar) side of the proximal row of the carpus, articulating with the lunate, pisiform, and hamate. Synonym: os triquetrum, cubital bone, os pyramidale, os triangulare, pyramidal bone, pyramidale, three-cornered bone, triquetrum. (05 Mar 2000) |
| RNA, transfer, thr | A transfer RNA which is specific for carrying threonine to sites on the ribosomes in preparation for protein synthesis. (12 Dec 1998) |
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