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calcareous
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- Calcareous - a. - Partaking of the nature of calcite or calcium carbonate; consisting of, or containing, calcium carbonate or carbonate of lime.
- Calcareousness - n. - Quality of being calcareous.
- Calcareo-siliceous - a. - Consisting of, or containing calcareous and siliceous earths.
- Decalcification - n. - The removal of calcareous matter.
- Cartilaginous - a. - 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.
- Eyestone - n. - A small, lenticular, calcareous body, esp. an operculum of a small marine shell of the family Turbinidae, used to remove a foreign substance from the eye. It is put into the inner corner of the eye under the lid, and allowed to work its way out at the outer corner, bringing with it the substance.
- Synapticula - n. - One of numerous calcareous processes which extend between, and unite, the adjacent septa of certain corals, especially of the fungian corals.
- Virgularian - n. - Any one of numerous species of long, slender Alcyonaria belonging to Virgularia and allied genera of the family Virgularidae. These corals are allied to the sea-pens, but have a long rodlike rhachis inclosing a slender, round or square, calcareous axis. The polyps are arranged in transverse rows or clusters along each side of the rhachis.
- Argillo-calcareous - a. - Consisting of, or containing, clay and calcareous earth.
- Calcareo-argillaceous - a. - consisting of, or containing, calcareous and argillaceous earths.
- Spirifer - n. - Any one of numerous species of fossil brachipods of the genus Spirifer, or Delthyris, and allied genera, in which the long calcareous supports of the arms form a large spiral, or helix, on each side.
- Synapta - n. - A genus of slender, transparent holothurians which have delicate calcareous anchors attached to the dermal plates. See Illustration in Appendix.
- 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 - n. - The free-swimming larva of sea urchins and ophiurans, having several long stiff processes inclosing calcareous rods.
- Turbo - n. - Any one of numerous marine gastropods of the genus Turbo or family Turbinidae, usually having a turbinate shell, pearly on the inside, and a calcareous operculum.
- Coralline - n. - A submarine, semicalcareous or calcareous plant, consisting of many jointed branches.
- Silicicalcareous - a. - Consisting of silica and calcareous matter.
- Chilostomata - n. pl. - 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.
- Epiphragm - n. - A membranaceous or calcareous septum with which some mollusks close the aperture of the shell during the time of hibernation, or aestivation.
- 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.
- Cirripedia - n. pl. - 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.
- Shell - n. - The hard calcareous or chitinous external covering of mollusks, crustaceans, and some other invertebrates. In some mollusks, as the cuttlefishes, it is internal, or concealed by the mantle. Also, the hard covering of some vertebrates, as the armadillo, the tortoise, and the like.
- Diaphragm - n. - A calcareous plate which divides the cavity of certain shells into two parts.
- Spicule - n. - Any small calcareous or siliceous body found in the tissues of various invertebrate animals, especially in sponges and in most Alcyonaria.
- Sclerenchyma - n. - The hard calcareous deposit in the tissues of Anthozoa, constituting the stony corals.
- Tufa - - A soft or porous stone formed by depositions from water, usually calcareous; -- called also calcareous tufa.
- Rhabdolith - n. - A minute calcareous rodlike structure found both at the surface and the bottom of the ocean; -- supposed by some to be a calcareous alga.