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Cementation :: Cementation (n.) A process which consists in surrounding a solid body with the powder of other substances, and heating the whole to a degree not sufficient to cause fusion, the physical properties of the body being changed by chemical combination with powder; thus iron becomes steel by cementation with charcoal, and green glass becomes porcelain by cementation with sand..

Nonconductor :: Nonconductor (n.) A substance which does not conduct, that is, convey or transmit, heat, electricity, sound, vibration, or the like, or which transmits them with difficulty; an insulator; as, wool is a nonconductor of heat; glass and dry wood are nonconductors of electricity..

Diaphanie :: Diaphanie (n.) The art of imitating //ined glass with translucent paper.

Enamel :: Enamel (v. t.) A variety of glass, used in ornament, to cover a surface, as of metal or pottery, and admitting of after decoration in color, or used itself for inlaying or application in varied colors..

Vitreous :: Vitreous (a.) Of or pertaining to glass; derived from glass; as, vitreous electricity..

Eyeglass :: Eyeglass (n.) A glass eyecup. See Eyecup.

Lorgnette :: Lorgnette (n.) elaborate double eyeglasses.

Glass-snake :: Glass-snake (n.) 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..

Platten :: Platten (a.) To flatten and make into sheets or plates; as, to platten cylinder glass..

Pince-nez :: Pince-nez (n.) Eyeglasses kept on the nose by a spring.

Lap :: Lap (n.) A piece of brass, lead, or other soft metal, used to hold a cutting or polishing powder in cutting glass, gems, and the like, or in polishing cutlery, etc. It is usually in the form of wheel or disk, which revolves on a vertical axis..

Heteropoda :: Heteropoda (n. pl.) An order of pelagic Gastropoda, having the foot developed into a median fin. Some of the species are naked; others, as Carinaria and Atlanta, have thin glassy shells..

Mirror :: Mirror (n.) A looking-glass or a speculum; any glass or polished substance that forms images by the reflection of rays of light.

Hyalospongia :: Hyalospongia (n. pl.) An order of vitreous sponges, having glassy six-rayed, siliceous spicules; -- called also Hexactinellinae..

Invitrifiable :: Invitrifiable (a.) Not admitting of being vitrified, or converted into glass..

Transparent :: Transparent (a.) Having the property of transmitting rays of light, so that bodies can be distinctly seen through; pervious to light; diaphanous; pellucid; as, transparent glass; a transparent diamond; -- opposed to opaque..

Micrometer :: Micrometer (n.) An instrument, used with a telescope or microscope, for measuring minute distances, or the apparent diameters of objects which subtend minute angles. The measurement given directly is that of the image of the object formed at the focus of the object glass..

Eyecup :: Eyecup (n.) A small oval porcelain or glass cup, having a rim curved to fit the orbit of the eye. it is used in the application of liquid remedies to eyes; -- called also eyeglass..

Amorphism :: Amorphism (n.) A state of being amorphous; esp. a state of being without crystallization even in the minutest particles, as in glass, opal, etc..

Aperture :: Aperture (n.) The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture..

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