shell

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Related to shelling: shelling out

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 classic literature ?
We boys were all shelling peas, but the story, as it went on, rapt us from the poor employ, and whatever our fingers were doing, our spirits were away in that strange land of adventures and mishaps, where the fevered life of the knight truly without fear and without reproach burned itself out.
Even while the passengers were crowding the starboard rail and scrambling into the few boats left to us, the submarine commenced shelling the ship.
As we sailed in to Langa-Langa, the British cruiser, the Cambrian, steamed out from the shelling of a village.