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shell |
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shell
Etymology: AS, scell 1 a hard outer protective covering that encloses material. 2 a principal energy level occupied by an electron in an atom. impression, eye A negative form or replica of the anterior part of the eye. A substance with rapid gelling properties is held in contact with the eye until gelled. This impression (or mould) is then used in the preparation of a positive model called a cast (or casting) of the anterior part of the eye: it is made by filling the impression with a material containing a plaster of Paris base which hardens to artificial stone. Using this cast a shell of a scleral contact lens is produced with optimum shape of the back surface. Syn. impression; impression moulding; mould; ocular impression. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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acanthor almond almond oil blast capsid carapace cochlea Combat Fatigue concha egg exoskeleton Friendly Fire Haliotis husk Minorca orbitals ostrac- plumping psyllium husk | COMIC Jim Davidson shells out the staggering sum of at least pounds 10,000 a week - before spending anything on himself - he has disclosed. |
shells out |
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