shell

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shell

(shel),
An outer covering.

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 ?
For the herein described ex ovo-cultivation method, egg contents of chicken eggs preincubated for 48 hours were gently transferred into a readily prepared shell-less containment, as demonstrated schematically in Figure 1.Development and morphology were compared to "normal stages of the chicken embryo" described by Hamburger and Hamilton [1].
Larvae of the pteropod Cavolinia inflexa exposed to aragonite undersaturation are viable but shell-less. Mar.
The 25-store upscale Parsippany, N.J.-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.
Significant rearing system by genotype interactions (R x G) were determined for all overall performance traits either at the p < 0.05 or p < 0.01 significance level except for shell-less egg ratio.
Newborn, free-swimming, microscopic, shell-less, eyed larvae are quickly placed in a special, warm tank in the hatchery to set on shell fragments, which are crushed up primarily from surf clams.
8:45 DECREASED PRESSURE AND INCREASED DEHYDRATION AS INDICATORS OF THE PROBLEMS ASSOCIATED WITH SHELL-LESS CHICK CULTURES **.
John struck a deal with tradesmen in Mexico and recently had a consignment of 29,000 shell-less coconuts shipped over to England.
lamellosa at Argyle Creek the next week (8.9.04), three individuals were found shell-less, whereas a fourth was found extruding partway out of its shell (Fig.
As for the 'internationally outstanding' part, the design looks like a giant shell-less mollusc crawling over a pile of slate.'