| slit-shell | <zoology> Any species of Pleurotomaria, a genus of beautiful, pearly, spiral gastropod shells having a deep slit in the outer lip. Many fossil species are known, and a few living ones are found in deep water in tropical seas. Source: Websters Dictionary (01 Mar 1998) |
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| spur-shell | <zoology> Any one of several species of handsome gastropod shells of the genus Trochus, or Imperator. The shell is conical, with the margin toothed somewhat like the rowel of a spur. Source: Websters Dictionary (01 Mar 1998) |
| diffusion shell | A small vessel made of a semipermeable membrane through which peptone, but not serum albumin, can pass; used in performing the Abderhalden test. (05 Mar 2000) |
| ioqua shell | <zoology> The shell of a large Dentalium (D. Pretiosum), formerly used as shell money, and for ornaments, by the Indians of the west coast of North America. Origin: From the native name. Source: Websters Dictionary (01 Mar 1998) |
| ear-shell | <zoology> A flattened marine univalve shell of the genus Haliotis. Synonym: sea-ear. See Abalone. Source: Websters Dictionary (01 Mar 1998) |
| egg shell nail | Thinning of nails resulting in bending and breaking of the free edge, with longitudinal fissures. Synonym: egg shell nail. Origin: hapalo-+ G. Onyx (onych-), nail (05 Mar 2000) |
| top-shell | <zoology> Any one of numerous species of marine top_shaped shells of the genus Thochus, or family Trochidae. Source: Websters Dictionary (01 Mar 1998) |
| trough-shell | <zoology> Any bivalve shell of the genus Mactra. See Mactra. Source: Websters Dictionary (01 Mar 1998) |
| tube-shell | <zoology> Any bivalve mollusk which secretes a shelly tube around its siphon, as the watering-shell. Source: Websters Dictionary (01 Mar 1998) |
| tulip-shell | <zoology> A large, handsomely coloured, marine univalve shell (Fasciolaria tulipa) native of the Southern United States. The name is sometimes applied also to other species of Fasciolaria. Source: Websters Dictionary (01 Mar 1998) |
| turban-shell | <zoology> A sea urchin when deprived of its spines; popularly so called from a fancied resemblance to a turban. Source: Websters Dictionary (01 Mar 1998) |
| turnip-shell | <zoology> Any one of several large, thick, spiral marine shells belonging to Rapa and allied genera, somewhat turnip-shaped. Source: Websters Dictionary (01 Mar 1998) |
| tusk-shell | <zoology> See Tusk. Source: Websters Dictionary (01 Mar 1998) |
| K shell | The innermost electron orbit or shell; it can hold two electrons. (05 Mar 2000) |
| fig-shell | <zoology> A marine univalve shell of the genus Pyrula, or Ficula, resembling a fig in form. Source: Websters Dictionary (01 Mar 1998) |