shell


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Related to shell: shell shock, Shell scripting

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 ?
I no longer felt the weight of my clothing, or of my shoes, of my reservoir of air, or my thick helmet, in the midst of which my head rattled like an almond in its shell.
A shell screaming like a storm banshee went over the huddled heads of the reserves.
This is done by means of a piece of mother-of-pearl shell, lashed firmly to the extreme end of a heavy stick, with its straight side accurately notched like a saw.
Our trees have prospered, and there is shell on my reef.
Another time, general attention was attracted by a small brown dog, coming heaven knows whence, which trotted in a preoccupied manner in front of the ranks with tail stiffly erect till suddenly a shell fell close by, when it yelped, tucked its tail between its legs, and darted aside.
I saw one shell burst in a group of women and children, and then I turned my head and covered my eyes.
Once or twice, with a queer, screeching sound, a shell, like a little puff of white smoke, passed high over the car and fell somewhere in the grey valley below.
It was his first shell, and it was a thousand times more terrible than he had imagined.
My hands were tied behind my back; and, clutching a shell in them, I rolled over and over, up the beach, till I came to the rocks I knew to be there.
The Eagle agreed and seizing the Tortoise by the shell with her talons soared aloft.
In the fight a year ago your house was burned by a Federal shell.
Very shortly thereafter the earth shook to the explosion of a shell within the city, and from time to time thereafter other shells burst at no great distance from the palace.