| glass-rope | <zoology> A remarkable vitreous sponge, of the genus Hyalonema, first brought from Japan. It has a long stem, consisting of a bundle of long and large, glassy, siliceous fibres, twisted together. Source: Websters Dictionary (01 Mar 1998) |
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| glass-snail | <zoology> A small, transparent, land snail, of the genus Vitrina. Source: Websters Dictionary (01 Mar 1998) |
| glass-snake | <zoology> A long, footless lizard (Ophiosaurus ventralis), of the Southern United States; so called from its fragility, the tail easily breaking into small pieces. It grows to the length of three feet. The name is applied also to similar species found in the Old World. Source: Websters Dictionary (01 Mar 1998) |
| glass-sponge | <zoology> A siliceous sponge, of the genus Hyalonema, and allied genera; so called from their glassy fibres or spicules. Synonym: vitreous sponge. See Glass-rope, and Euplectella. Source: Websters Dictionary (01 Mar 1998) |
| vita glass | A specially prepared glass that is transparent to ultraviolet rays of the spectrum. (05 Mar 2000) |
| ground-glass pattern | Radiographic or CT appearance of hazy opacity which fails to obscure pulmonary vascular markings. (05 Mar 2000) |
| water glass | <chemistry> See Soluble glass, under Glass. Source: Websters Dictionary (01 Mar 1998) |
| Wood's glass | A glass containing nickel oxide, used in Wood's lamp. (05 Mar 2000) |
| cover glass | A thin glass disk or plate covering an object examined under the microscope. Synonym: coverslip. (05 Mar 2000) |
| Crookes' glass | A spectacle lens combined with metallic oxides to absorb ultraviolet or infrared rays. (05 Mar 2000) |
| crown glass | A compound of lime, potash, alumina, and silica; commonly used in lenses; has a low dispersion (52.2) relative to index of refraction (1.523). (05 Mar 2000) |
| cupping glass | A glass vessel, from which the air has been exhausted by heat or a special suction apparatus, formerly applied to the skin in order to draw blood to the surface. See: cupping, cup. Synonym: cup. (05 Mar 2000) |
| half-glass spectacles | Spectacles, used for reading, in which the upper portion of the lenses are removed. Synonym: clerical spectacles, pantoscopic spectacles, pulpit spectacles. (05 Mar 2000) |
| soluble glass | A silicate of potassium or sodium, soluble in hot water but solid at ordinary temperatures; used for fixed dressings. Synonym: water glass. (05 Mar 2000) |
| quartz glass | A transparent, colourless crystal, made by fusing pure quartz sand, which transmits ultraviolet light. (05 Mar 2000) |