polyhedra

Plural of polyhedron. polyhedral (pol-i-he'dral), a. [ polyhedric (pol-i-hēʼdrik), a. [= F. polyé drique; as polyhedr - on + -ic.] Same as poly hedral. IMG:content-0587.png:[blocks in formation] poly he drome try (pol i-he-dromʼet-ri), [ + The system of theorems concerning the numbers of faces, edges, and summits of polyhedra, the numbers of edges belonging to the different faces and summits, and other allied matters. The name is ill formed to expre this idea. ily of extinct North American Eocene marsupial mammals, represented by the genus Poly mas to don. They had molars with numerous tubercles arranged in three imperfect or two longitudinal rows. They were of small size. =