Etymology
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dodecahedron (n.)

"solid having twelve faces," 1560s, from Greek dōdeka "twelve" (see dodeca-) + hedra "seat, base, chair, face of a geometric solid," from PIE root *sed- (1) "to sit." Related: Dodecahedral.

updated on October 31, 2018

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Definitions of dodecahedron from WordNet

dodecahedron (n.)
any polyhedron having twelve plane faces;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.