nounpl. -·drons or -·dra
a solid figure with eight plane surfaces
Origin of octahedronClassical Greek oktaedron, neuter of oktaedros: see octa- and -hedron
nounpl. oc·ta·he·drons, or oc·ta·he·dra
A polyhedron with eight faces.
Origin of octahedronGreek oktaedron from neuter of oktaedros having eight sides okta- octo- -edros sided ; see -hedron .
(plural octahedra or octahedrons)
From Ancient Greek á½€ÎºÏ„ÏŽ (oktÅ, “eight") + á¼•Î´ÏÎ± (hedra, “seat").