| AHT | aggregation half time; antihyaluronidase titer; augmented histamine test; autogenous hamster tumor |
|---|---|
| BHL | bilateral hilar lymphadenopathy; biological half-life |
| EHL | effective half-life; electrohydraulic lipotripsy; endogenous hyperlipidemia; Environmental Health La... |
| FWHM | full width at half maximum |
| H1/2 | half-value layer |
| HASTE | half Fourier single shot turbo spin echo |
|---|---|
| HBI | half body irradiation |
| 1/2 RT | half-relaxation time |
| T2 | half-time |
| bubble shell | <zoology> A marine univalve shell of the genus Bulla and allied genera, belonging to the Tectibranchiata. Source: Websters Dictionary (01 Mar 1998) |
|---|---|
| maara shell | <zoology> A large, pearly, spiral, marine shell (Turbo margaritaceus), from the Pacific Islands. It is used as an ornament. Source: Websters Dictionary (01 Mar 1998) |
| valve-shell | <zoology> Any fresh water gastropod of the genus Valvata. Source: Websters Dictionary (01 Mar 1998) |
| mail-shell | <zoology> A chiton. Source: Websters Dictionary (01 Mar 1998) |
| mask shell | <zoology> Any spiral marine shell of the genus Persona, having a curiously twisted aperture. Source: Websters Dictionary (01 Mar 1998) |
| goroon shell | <zoology> A large, handsome, marine, univalve shell (Triton femorale). Source: Websters Dictionary (01 Mar 1998) |
| rice-shell | <zoology> Any one of numerous species of small white polished marine shells of the genus Olivella. Source: Websters Dictionary (01 Mar 1998) |
| wedge-shell | <zoology> Any one of numerous species of small marine bivalves belonging to Donax and allied genera in which the shell is wedge-shaped. Source: Websters Dictionary (01 Mar 1998) |
| wing-shell | <zoology> Any one of various species of marine bivalve shells belonging to the genus Avicula, in which the hinge border projects like a wing. Any marine gastropod shell of the genus Strombus. See Strombus. Any pteropod shell. Source: Websters Dictionary (01 Mar 1998) |
| worm-shell | <zoology> Any species of Vermetus. Source: Websters Dictionary (01 Mar 1998) |
| wreath-shell | <zoology> A marine shell of the genus Turbo. See Turbo. Source: Websters Dictionary (01 Mar 1998) |
| pouch-shell | <zoology> A small British and American pond snail (Bulinus hypnorum). Source: Websters Dictionary (01 Mar 1998) |
| cytotrophoblastic shell | The external layer of foetally derived trophoblastic cells on the maternal surface of the placenta. (05 Mar 2000) |
| shell | 1. A hard outside covering, as of a fruit or an animal. Specifically: The covering, or outside part, of a nut; as, a hazelnut shell. A pod. The hard covering of an egg. "Think him as a serpent's egg, . . . And kill him in the shell. <mathematics> " (Shak) Hence, by extension, any mollusks having such a covering. 2. A hollow projectile, of various shapes, adapted for a mortar or a cannon, and containing an explosive substance, ignited with a fuse or by percussion, by means of which the projectile is burst and its fragments scattered. See Bomb. 3. The case which holds the powder, or charge of powder and shot, used with breechloading small arms. 4. Any slight hollow structure; a framework, or exterior structure, regarded as not complete or filled in; as, the shell of a house. 5. A coarse kind of coffin; also, a thin interior coffin inclosed in a more substantial one. 6. An instrument of music, as a lyre, the first lyre having been made, it is said, by drawing strings over a tortoise shell. "When Jubal struck the chorded shell." (Dryden) 7. An engraved copper roller used in print works. 8. The husks of cacao seeds, a decoction of which is often used as a substitute for chocolate, cocoa, etc. 9. The outer frame or case of a block within which the sheaves revolve. 10. A light boat the frame of which is covered with thin wood or with paper; as, a racing shell. Message shell, a bombshell inside of which papers may be put, in order to convey messages. Shell bit, a tool shaped like a gouge, used with a brace in boring wood. See Bit. Shell button. A button made of shell. A hollow button made of two pieces, as of metal, one for the front and the other for the back, often covered with cloth, silk, etc. Shell cameo, a cameo cut in shell instead of stone. Shell flower. <botany> A kind of marl characterised by an abundance of shells, or fragments of shells. Shell meat, food consisting of shellfish, or testaceous mollusks. Shell mound. See Mound. Shell of a boiler, the exterior of a steam boiler, forming a case to contain the water and steam, often inclosing also flues and the furnace; the barrel of a cylindrical, or locomotive, boiler. Shell road, a road of which the surface or bed is made of shells, as oyster shells. Shell sand, minute fragments of shells constituting a considerable part of the seabeach in some places. Origin: OE. Shelle, schelle, AS. Scell, scyll; akin to D. Shel, Icel. Skel, Goth. Skalja a tile, and E. Skill. Cf. Scale of fishes, Shale, Skill. Source: Websters Dictionary (01 Mar 1998) |
| shell nail | Bronchiectasis with excessive longitudinal curvature of the nail plate and atrophy of the nail bed and underlying bone. (05 Mar 2000) |