tetragyn1a

pl. [Pref. tetra-, and Greek gyně a woman, a female.] Bot .: An order of plants in Linnæus' Artificial System. It consisted of plants having four pistils. The cla es Tetrandria, Pent and ria, Hexandria, Hept and ria, Oct and ria, and Poly and ria, have each IMG:content-0947.png:[blocks in formation] (1) Having the form of the regular tetrahedron. (2) Pertaining or relating to a tetrahedron, or the system of forms to which the tetrahedron belongs. tetrahedral-angle, s . Geom.: A polyhedral angle having four faces. tetrahedral-garnet, s. Min.: The same as HELVINE (q. v.).