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Clypeastroid :: Clypeastroid (a.) Like or related to the genus Clupeaster; -- applied to a group of flattened sea urchins, with a rosette of pores on the upper side..

Ortho- :: Ortho- () The one of several acids of the same element (as the phosphoric acids), which actually occurs with the greatest number of hydroxyl groups; as, orthophosphoric acid. Cf. Normal..

Thallium :: Thallium (n.) A rare metallic element of the aluminium group found in some minerals, as certain pyrites, and also in the lead-chamber deposit in the manufacture of sulphuric acid. It is isolated as a heavy, soft, bluish white metal, easily oxidized in moist air, but preserved by keeping under water. Symbol Tl. Atomic weight 203.7..

Di- :: Di- () denoting two atoms, radicals, groups, or equivalents, as the case may be. See Bi-, 2..

Hovel :: Hovel (n.) A large conical brick structure around which the firing kilns are grouped.

Grouse :: Grouse (n. sing. & pl.) Any of the numerous species of gallinaceous birds of the family Tetraonidae, and subfamily Tetraoninae, inhabiting Europe, Asia, and North America. They have plump bodies, strong, well-feathered legs, and usually mottled plumage. The group includes the ptarmigans (Lagopus), having feathered feet..

Subordinacy :: Suborder (n.) A division of an order; a group of genera of a little lower rank than an order and of greater importance than a tribe or family; as, cichoraceous plants form a suborder of Compositae..

Terebene :: Terebene (n.) A polymeric modification of terpene, obtained as a white crystalline camphorlike substance; -- called also camphene. By extension, any one of a group of related substances..

Azo- :: Azo- () Now especially applied to compounds containing a two atom nitrogen group uniting two hydrocarbon radicals, as in azobenzene, azobenzoic, etc. These compounds furnish many artificial dyes. See Diazo-..

Karyokinesis :: Karyokinesis (n.) The indirect division of cells in which, prior to division of the cell protoplasm, complicated changes take place in the nucleus, attended with movement of the nuclear fibrils; -- opposed to karyostenosis. The nucleus becomes enlarged and convoluted, and finally the threads are separated into two groups which ultimately become disconnected and constitute the daughter nuclei. Called also mitosis. See Cell development, under Cell..

Representative :: Representative (n.) That which presents the full character of the type of a group.

Zoanthus :: Zoanthus (n.) A genus of Actinaria, including numerous species, found mostly in tropical seas. The zooids or polyps resemble small, elongated actinias united together at their bases by fleshy stolons, and thus forming extensive groups. The tentacles are small and bright colored..

Euisopoda :: Euisopoda () A group which includes the typical Isopoda.

Superordination :: Superorder (n.) A group intermediate in importance between an order and a subclass.

Hydramide :: Hydramide (n.) One of a group of crystalline bodies produced by the action of ammonia on certain aldehydes.

Lyrid :: Lyrid (n.) One of the group of shooting stars which come into the air in certain years on or about the 19th of April; -- so called because the apparent path among the stars the stars if produced back wards crosses the constellation Lyra.

Fluorine :: Fluorine (n.) A non-metallic, gaseous element, strongly acid or negative, or associated with chlorine, bromine, and iodine, in the halogen group of which it is the first member. It always occurs combined, is very active chemically, and possesses such an avidity for most elements, and silicon especially, that it can neither be prepared nor kept in glass vessels. If set free it immediately attacks the containing material, so that it was not isolated until 1886. It is a pungent, corrosive, colorles

Subtrihedral :: Subtribe (n.) A division of a tribe; a group of genera of a little lower rank than a tribe.

Coelodont :: Coelodont (a.) Having hollow teeth; -- said of a group lizards.

Brachyura :: Brachyura (n. pl.) A group of decapod Crustacea, including the common crabs, characterized by a small and short abdomen, which is bent up beneath the large cephalo-thorax. [Also spelt Brachyoura.] See Crab, and Illustration in Appendix..

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