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Chondropterygii :: Chondropterygii (n. pl.) A group of fishes, characterized by cartilaginous fins and skeleton. It includes both ganoids (sturgeons, etc.) and selachians (sharks), but is now often restricted to the latter..

Ammonitoidea :: Ammonitoidea (n. pl.) An extensive group of fossil cephalopods often very abundant in Mesozoic rocks. See Ammonite.

Pallah :: Pallah (n.) A large South African antelope (Aepyceros melampus). The male has long lyrate and annulated horns. The general color is bay, with a black crescent on the croup. Called also roodebok..

Hamilton Period :: Hamilton period () A subdivision of the Devonian system of America; -- so named from Hamilton, Madison Co., New York. It includes the Marcellus, Hamilton, and Genesee epochs or groups. See the Chart of Geology..

Retinophora :: Retinophora (n.) One of group of two to four united cells which occupy the axial part of the ocelli, or ommatidia, of the eyes of invertebrates, and contain the terminal nerve fibrillae. See Illust. under Ommatidium..

Aggrouped :: Aggrouped (imp. & p. p.) of Aggrou.

Cnidaria :: Cnidaria (n. pl.) A comprehensive group equivalent to the true Coelenterata, i. e., exclusive of the sponges. They are so named from presence of stinging cells (cnidae) in the tissues. See Coelenterata..

Acrania :: Acrania (n.) The lowest group of Vertebrata, including the amphioxus, in which no skull exists..

Mon- :: Mon- () A prefix signifying one, single, alone; as, monocarp, monopoly; (Chem.) indicating that a compound contains one atom, radical, or group of that to the name of which it is united; as, monoxide, monosulphide, monatomic, etc..

Acrodont :: Acrodont (n.) One of a group of lizards having the teeth immovably united to the top of the alveolar ridge.

Colorado Group :: Colorado group () A subdivision of the cretaceous formation of western North America, especially developed in Colorado and the upper Missouri region..

Runner :: Runner (n.) A tool on which lenses are fastened in a group, for polishing or grinding..

Feldspath :: Feldspath (n.) A name given to a group of minerals, closely related in crystalline form, and all silicates of alumina with either potash, soda, lime, or, in one case, baryta. They occur in crystals and crystalline masses, vitreous in luster, and breaking rather easily in two directions at right angles to each other, or nearly so. The colors are usually white or nearly white, flesh-red, bluish, or greenish..

Insessor :: Insessor (n.) One of the Insessores. The group includes most of the common singing birds.

Monocarbonic :: Monocarbonic (a.) Containing one carboxyl group; as, acetic acid is a monocarbonic acid..

Apoda :: Apoda (n.) A group of worms without appendages, as the leech..

Stelleridan :: Stellerida (n. pl.) An extensive group of echinoderms, comprising the starfishes and ophiurans..

Class :: Class (n.) A group of individuals ranked together as possessing common characteristics; as, the different classes of society; the educated class; the lower classes..

Ailuroidea :: Ailuroidea (n. pl.) A group of the Carnivora, which includes the cats, civets, and hyenas..

Oxybutyric :: Oxybutyric (a.) Hydroxybutyric; designating any one of a group of metameric acids (C3H6.OH.CO2H).

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