sb. and a. Zool. [f. TETRA- + Gr. βράγχια gills.] a. sb. A four-gilled cephalopod: see next. b. adj. TETRABRANCHIATE a. (Cent. Dict., 1891).
1851. Woodward, Mollusca, I. 82. The Tetrabranchs could undoubtedly swim, by their respiratory jets.
1877. Le Conte, Elem. Geol., II. (1879), 305. If we divide all known Cephalopods into Dibranchs (two-gilled) and Tetrabranchs (four-gilled).
