shell

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shell

(shel),
An outer covering.

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.

shell

(shel)
An outer covering.

shell

any hard outer covering, such as the carapace of turtles and tortoises, the exoskeleton of crustaceans, the calcareous plates of echinoderms, the outermost membranes of an egg, the skeleton of Foraminifera or the mantle secretions of molluscs.

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.
References in periodicals archive ?
based supermarket chain has scored a major hit by marketing Kings Completely Naked Lobster--a 100% intact, shell-less, 1 1/2 pound whole lobster with all of the succulent lobster meat removed.
I'VE CRACKED IT : John Grimmett is hoping his shell-less coconuts business will take off
As for the 'internationally outstanding' part, the design looks like a giant shell-less mollusc crawling over a pile of slate.
Leatherbacks can swim extraordinary distances and dive to extraordinary depths due to their ability to regulate body temperature and their flexible, shell-less, streamlined bodies.