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 ?
But again the financial gulf between the English Premiership and SPL was in evidence as Spurs shelled out more than pounds 16m to sign Darren Bent from Charlton - almost double the ENTIRE money spent by SPL clubs.
The former Villa keeper was surprised that John Gregory shelled out for the former Manchester United hero rather than promote understudy Peter Enckelman.
Terry Adams' ERA blasted off about the same time a Los Angeles mogul shelled out $20 million to see Earth in his rearview mirror.