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Synarchy :: Synapticula (n.) One of numerous calcareous processes which extend between, and unite, the adjacent septa of certain corals, especially of the fungian corals..

Thinolite :: Thinolite (n.) A calcareous tufa, in part crystalline, occurring on a large scale as a shore deposit about the Quaternary lake basins of Nevada..

Epiphragm :: Epiphragm (n.) A membranaceous or calcareous septum with which some mollusks close the aperture of the shell during the time of hibernation, or aestivation..

Semicalcareous :: Semicalcareous (a.) Half or partially calcareous; as, a semicalcareous plant..

Calcariferous :: Calcariferous (a.) Lime-yielding; calciferou.

Serpula :: Serpula (n.) Any one of numerous species of tubicolous annelids of the genus Serpula and allied genera of the family Serpulidae. They secrete a calcareous tube, which is usually irregularly contorted, but is sometimes spirally coiled. The worm has a wreath of plumelike and often bright-colored gills around its head, and usually an operculum to close the aperture of its tube when it retracts..

Hippocampus :: Hippocampus (n.) A name applied to either of two ridges of white matter in each lateral ventricle of the brain. The larger is called hippocampus major or simply hippocampus. The smaller, hippocampus minor, is called also ergot and calcar..

Calcify :: Calcify (v. i.) To become changed into a stony or calcareous condition, in which lime is a principal ingredient, as in the formation of teeth..

Calcar :: Calcar (n.) A curved ridge in the floor of the leteral ventricle of the brain; the calcar avis, hippocampus minor, or ergot..

Syconium :: Sycones (n. pl.) A division of calcareous sponges.

Marlstone :: Marlstone (n.) A sandy calcareous straum, containing, or impregnated with, iron, and lying between the upper and lower Lias of England..

Anchor :: Anchor (n.) One of the anchor-shaped spicules of certain sponges; also, one of the calcareous spinules of certain Holothurians, as in species of Synapta..

Pluteus :: Pluteus (n.) The free-swimming larva of sea urchins and ophiurans, having several long stiff processes inclosing calcareous rods..

Ergot :: Ergot (n.) See 2d Calcar, 3 (b)..

Petrify :: Petrify (v. i.) To become stone, or of a stony hardness, as organic matter by calcareous deposits..

Calcify :: Calcify (v. t.) To make stony or calcareous by the deposit or secretion of salts of lime.

Sclerobase :: Sclerobase (n.) The calcareous or hornlike coral forming the central stem or axis of most compound alcyonarians; -- called also foot secretion. See Illust. under Gorgoniacea, and Coenenchyma..

Marl :: Marl (n.) A mixed earthy substance, consisting of carbonate of lime, clay, and sand, in very varivble proportions, and accordingly designated as calcareous, clayey, or sandy. See Greensand..

Calcite :: Calcite (n.) Calcium carbonate, or carbonate of lime. It is rhombohedral in its crystallization, and thus distinguished from aragonite. It includes common limestone, chalk, and marble. Called also calc-spar and calcareous spar..

Corneocalcareous :: Corneocalcareous (a.) Formed of a mixture of horny and calcareous materials, as some shells and corals..

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