Origin of tetrahedronModern Latin ; from neuter of Late Greek tetraedros, four-sided: see tetra- and amp; -hedron
nounpl. tet·ra·he·drons or tet·ra·he·dra
Origin of tetrahedronGreek tetraedron, from neuter of tetraedros, four-faced : tetra-, tetra- + -hedros, sided; see –hedron.
(plural tetrahedrons or tetrahedra)
From Ancient Greek Ï„ÎµÏ„ÏÎ¬ÎµÎ´ÏÏŒÎ½ (tetraedron, “triangle-based pyramid"), from Ï„ÎµÏ„ÏÎ¬ÎµÎ´ÏÏŒÏ‚, from Ï„ÎµÏ„ÏÎ¬Ï‚ (tetras, “four") + á¼•Î´ÏÎ± (hedra, “seat").