- prismatic layer
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the middle layer of the shell of certain mollusks, consisting chiefly of crystals of calcium carbonate.
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Universalium. 2010.
prismatic layer
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prismatic layer — noun 1. also prismatic tissue : a layer of secondary tissue developed internally by the cambium of some lycopods (as the quillworts) and interpreted as xylem, phloem, or both 2. : the middle layer of the shell of a mollusk consisting essentially… … Useful english dictionary
prismatic tissue — noun see prismatic layer 1 … Useful english dictionary
Gyrated triangular prismatic honeycomb — The gyrated triangular prismatic honeycomb is a space filling tessellation (or honeycomb) in Euclidean 3 space made up of triangular prisms. It is vertex uniform with 12 triangular prisms per vertex.It can be seen as parallel planes of square… … Wikipedia
Mollusc shell — Closed and open shells of a marine bivalve, Petricola pholadiformis. A bivalve shell is composed of two hinged valves which are joined by a ligament … Wikipedia
bivalve — bivalvular /buy val vyeuh leuhr/, adj. /buy valv /, n. 1. Also called lamellibranch. Zool. any mollusk, as the oyster, clam, scallop, or mussel, of the class Bivalvia, having two shells hinged together, a soft body, and lamellate gills. adj. 2.… … Universalium
Mussel — Not to be confused with muscle. Mussel Blue mussels Mytilus edulis in the intertidal zone in Cornwall, England Scientific classification Kingdom … Wikipedia
integument — /in teg yeuh meuhnt/, n. 1. a natural covering, as a skin, shell, or rind. 2. any covering, coating, enclosure, etc. [1605 15; < L integumentum a covering. See IN 2, TEGUMENT] Syn. 1. cortex, involucre, involucrum. * * * Covering of the body,… … Universalium
Neopilina — Scientific classification Kingdom: Animalia Phylum … Wikipedia
Optical overheating protection — With all solar thermal collector systems there is a potential risk that the solar collector may reach an equilibrium or stagnation temperature higher than the maximum safe operating temperature. Various measures are taken for optical overheating… … Wikipedia
Convex uniform honeycomb — The alternated cubic honeycomb is one of 28 space filling uniform tessellations in Euclidean 3 space, composed of alternating yellow tetrahedra and red octahedra. In geometry, a convex uniform honeycomb is a uniform tessellation which fills three … Wikipedia
