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 ?
A former actor, Sheller enjoys numerous active outdoor pursuits, and recently renovated his 100-year old house in Red Hook, Brooklyn.
C against Qasim Ali, Shoukat Ali and Ansar Ali owners of the under construction sheller and have arrested Qasim Ali while two others manage their good escape.
Sheller argues that to act and make claims as free citizens, political subjects must have confidence to engage in action on their own behalf.
Sheller joined Deutsche Bank with over 20 years of experience in sales, primarily in the alternative fund services space.
The Universal Nut Sheller provided a crash course in small-scale, low-cost, environmentally friendly machinery that makes the most of available and renewable resources.
The college will draw water from the canal for its cooling systems and return the water to the canal "slightly warmer and a lot cleaner," according to Mr Sheller.
Paul, the peanut sheller from the Full Belly Project, and the maize crusher from the Agriculture Research Council of South Africa (www.
I was excited when I found the sheller from Embarcadero Home Cannery, and I gave it to him for Christmas because he normally lets the nuts cure on a covered patio until after Christmas each year.
Sheller stared, "Extensive planning has gone into securing the proper amount of railcars to support this move from Oshkosh, WI, to Charleston, SC.
Sheller as corporate secretary, succeeding Laurence L.
The Universal Nut Sheller costs $28 to make and has raised village incomes by an estimated 20 percent.
With Harris out, Sean Sheller and Nate Chandler are expected to compete for reps with the first team.