The plural form of decahedron; multiple three-dimensional shapes with ten flat faces.
From Greek deca- (ten) + hedra (face/side). This is the standard plural form, following Greek pluralization patterns rather than simply adding -s.
The plural 'decahedra' uses the original Greek plural form instead of just adding 's'—it's a reminder that English borrowed so much from Greek that we sometimes inherited their grammar too!
Complete word intelligence in one call. Free tier — 50 lookups/day.