From The Collaborative International Dictionary of English v.0.44 [gcide]:
Periostracum \Per'i*os"tra*cum\, noun; pl. {Periostraca}. [NL., fr. Gr. ? around + ? shell of a testacean.] (Zo["o]l.) A chitinous membrane covering the exterior of many shells; -- called also {epidermis}.
From The Collaborative International Dictionary of English v.0.44 [gcide]:
Epidermis \Ep'i*der"mis\, noun [L., fr. Gr. ?; ? over + ? skin, fr. ? to skin. See {Tear}, verb (used with an object)]
1. (Anat.) The outer, nonsensitive layer of the skin; cuticle; scarfskin. See {Dermis}.
2. (Bot.) The outermost layer of the cells, which covers both surfaces of leaves, and also the surface of stems, when they are first formed. As stems grow old this layer is lost, and never replaced.
From WordNet (r) 2.0 [wn]:
noun
1: the outer layer of the skin covering the exterior body surface of vertebrates [syn: {cuticle}]
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
60 Moby Thesaurus words for "epidermis": blastoderm, border, circumference, corium, cortex, covering, crust, cursoriness, cutis, cutis vera, derma, dermis, ectoblast, ectoderm, endothelium, entoderm, envelope, epiblast, epithelium, exterior, exteriority, external, facade, face, facet, fringe, front, gloss, hypodermis, integument, lineaments, mere scratch, mesoderm, no depth, no water, outer face, outer layer, outer side, outer skin, outline, outside, pavement epithelium, periphery, pinprick, rind, scarfskin, scratch, shallowness, shell, shoaliness, skin, slightness, superficiality, superficies, superstratum, surface, top, triviality, true skin, veneer
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