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The process of chenge into a stony or calcareous substance by the deposition of lime salt; -- normally, as in the formation of bone and teeth; abnormally, as in calcareous degeneration of tissue.

Consisting of, or containing, calcareous matter or lime salts; calcareous.

To make stony or calcareous by the deposit or secretion of salts of lime.

An order of marine sponges, containing calcareous spicules. See Porifera.

rom aragonite. It includes common limestone, chalk, and marble. Called also calc-spar and calcareous spar.

Having the skeleton in the state of cartilage, the bones containing little or no calcareous matter; said of certain fishes, as the sturgeon and the sharks.

An extensive suborder of marine Bryozoa, mostly with calcareous shells. They have a movable lip and a lid to close the aperture of the cells. [Also written Chillostomata.]

An order of Crustacea including the barnacles. When adult, they have a calcareous shell composed of several pieces. From the opening of the shell the animal throws out a group of curved legs, looking like a delicate curl, whence the name of the group. See Anatifa.

One of a kind of minute, calcareous bodies, probably vegetable, often abundant in deep-sea mud.

A large, highly esteemed, edible fish of India (Lates calcarifer); -- also called begti.

ounded mass or nodule produced by an aggregation of the material around a center; as, the calcareous concretions common in beds of clay.

osed or rounded fragments of stone cemented together by another mineral substance, either calcareous, siliceous, or argillaceous; pudding stone; -- opposed to agglomerate. See Breccia. A conglomerate, therefore, is simply gravel bound together by a cement. Lyell.

A submarine, semicalcareous or calcareous plant, consisting of many jointed branches.

The coral or skeleton of a zoöphyte, whether calcareous of horny, simple or compound. See Coral.

(Zoöl.), an Asiatic plover (Dromas ardeola). -- Crab's eyes, or Crab's stones, masses of calcareous matter found, at certain seasons of the year, on either side of the stomach of the European crawfishes, and formerly used in medicine for absorbent and antacid purposes; the gastroliths. -- Crab spider (Zoöl.), one of…

The removal of calcareous matter.

To deprive of calcareous matter; thus, to decalcify bones is to remove the stony part, and leave only the gelatin.

A calcareous plate which divides the cavity of certain shells into two parts.

One of the transverse, calcareous partitions between the radiating septa of a coral.

The class Echinodermata which includes the sea urchins. They have a calcareous, usually more or less spheroidal or disk-shaped, composed of many united plates, and covered with movable spines. See Spatangoid, Clypeastroid. [Written also Echinidea, and Echinoida.]