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Zirconium :: Zirconium (n.) A rare element of the carbon-silicon group, intermediate between the metals and nonmetals, obtained from the mineral zircon as a dark sooty powder, or as a gray metallic crystalline substance. Symbol Zr. Atomic weight, 90.4..

Nitro- :: Nitro- () A combining form (used also adjectively) designating certain compounds of nitrogen or of its acids, as nitrohydrochloric, nitrocalcite; also, designating the group or radical NO2, or its compounds, as nitrobenzene..

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..

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..

Siphonobranchiata :: Siphonobranchiata (n. pl.) A tribe of gastropods having the mantle border, on one or both sides, prolonged in the form of a spout through which water enters the gill cavity. The shell itself is not always siphonostomatous in this group..

Wealden :: Wealden (n.) The Wealden group or strata.

Croupous :: Croupous (a.) Relating to or resembling croup; especially, attended with the formation of a deposit or membrane like that found in membranous croup; as, croupous laryngitis..

Flying Squirrel :: Flying squirrel () One of a group of squirrels, of the genera Pteromus and Sciuropterus, having parachute-like folds of skin extending from the fore to the hind legs, which enable them to make very long leaps..

Sauropsida :: Sauropsida (n. pl.) A comprehensive group of vertebrates, comprising the reptiles and birds..

Acrita :: Acrita (n. pl.) The lowest groups of animals, in which no nervous system has been observed..

Micronesian :: Micronesian (a.) Of or pertaining to Micronesia, a collective designation of the islands in the western part of the Pacific Ocean, embracing the Marshall and Gilbert groups, the Ladrones, the Carolines, etc..

Osmium :: Osmium (n.) A rare metallic element of the platinum group, found native as an alloy in platinum ore, and in iridosmine. It is a hard, infusible, bluish or grayish white metal, and the heaviest substance known. Its tetroxide is used in histological experiments to stain tissues. Symbol Os. Atomic weight 191.1. Specific gravity 22.477..

Molybdenum :: Molybdenum (n.) A rare element of the chromium group, occurring in nature in the minerals molybdenite and wulfenite, and when reduced obtained as a hard, silver-white, difficulty fusible metal. Symbol Mo. Atomic weight 95.9..

Dicynodont :: Dicynodont (n.) One of a group of extinct reptiles having the jaws armed with a horny beak, as in turtles, and in the genus Dicynodon, supporting also a pair of powerful tusks. Their remains are found in triassic strata of South Africa and India..

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

Edentata :: Edentata (n. pl.) An order of mammals including the armadillos, sloths, and anteaters; -- called also Bruta. The incisor teeth are rarely developed, and in some groups all the teeth are lacking..

Asiphonida :: Asiphonida (n. pl.) A group of bivalve mollusks destitute of siphons, as the oyster; the asiphonate mollusks..

Faculae :: Faculae (n. pl.) Groups of small shining spots on the surface of the sun which are brighter than the other parts of the photosphere. They are generally seen in the neighborhood of the dark spots, and are supposed to be elevated portions of the photosphere..

Degrade :: Degrade (v. i.) To degenerate; to pass from a higher to a lower type of structure; as, a family of plants or animals degrades through this or that genus or group of genera..

Syndyasmian :: Syndrome (n.) A group of symptoms occurring together that are characteristic and indicative of some underlying cause, such as a disease..

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