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A tetravalent or quadrivalent atom or radical; as, carbon is a tetrad.

Tetradactylous.

Having, or characterized by, four digits to the foot or hand.

A light oily hydrocarbon, C14H30, of the marsh-gas series; -- so called from the fourteen carbon atoms in the molecule.

Same as Arthrostraca.

Of or pertaining to a tetrad; possessing or having the characteristics of a tetrad; as, a carbon is a tetradic element.

A person in some way remarkable with regard to the number four, as one born on the fourth day of the month, or one who reverenced four persons in the Godhead. Smart.

See Tetrodon.

See Tetrodont.

A silver coin among the ancient Greeks, of the value of four drachms. The Attic tetradrachm was equal to 3s. 3d. sterling, or about 76 cents.

A telluride of bismuth. It is of a pale steel-gray color and metallic luster, and usually occurs in foliated masses. Calles also telluric bismuth.

A Linnæan class of plants having six stamens, four of which are longer than the others.

A plant of the order Tetradynamia.

Belonging to the order Tetradynamia; having six stamens, four of which are uniformly longer than the others.

posterior legs are usually turned upward and backward. The beach flea is an example. See Tetradecapoda and Arthrostraca.

rger divisions of Crustacea, so called because the thorax and abdomen are both segmented; Tetradecapoda. It includes the Amphipoda and Isopoda.

teeth and jaws consolidated into one or two bony plates, on each jaw, as the diodonts and tetradonts. See Bur fish, Globefish, Diodon.

The long-tailed pangolin (Manis tetradactyla); -- called also ipi.

o used adjectively; as, a sarcina micrococcus; a sarcina group. Sarcina form (Biol.), the tetrad form seen in the division of a dumb-bell group of micrococci into four; -- applied particularly to bacteria. See micrococcus.

he stater best known at Athens being worth about £1 2s., or about $5.35. The Attic silver tetradrachm was in later times called stater.