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charophyceae
Science; General science
A group of branched, filamentous green algae, commonly known as the stoneworts, brittleworts, or muskgrasses, that occur mostly in fresh- or brackish-water habitats. They are ...
coordination complexes
Science; General science
A group of chemical compounds in which all or a part of the molecular bonding is of the coordinate covalent type.
vitamin B
Science; General science
A group of closely related polypyrrole compounds containing trivalent cobalt (see illus. ); often called cobalamin. The vitamin is a dark-red crystalline compound; in aqueous ...
amphibole
Science; General science
A group of common ferromagnesian silicate minerals that occur as major or minor constituents in a wide variety of rocks. The crystal structure of the amphiboles is very flexible ...
cermet
Science; General science
A group of composite materials consisting of an intimate mixture of ceramic and metallic components.
vitamin K
Science; General science
A group of compounds derived from 2-methyl-1,4-naphthoquinone that prevent bleeding in mammals and birds. Vitamin K 1 (phylloquinone) is produced by green plants; a related form, ...
hemichordata
Science; General science
A group of deuterostome animals that includes the classes Enteropneusta, Pterobranchia, and Planctosphaeroidea. The last, a monospecific class, is represented by Planctosphaera ...
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