The plural form of decahedron using English pluralization; multiple ten-faced three-dimensional shapes.
From decahedron + -s (English plural suffix). While decahedra is the Greek plural, English speakers often add -s to Greek-derived words, creating decahedrons as an alternative plural.
The existence of both 'decahedra' and 'decahedrons' shows how English is flexible and evolving—some people stick to classical Greek plurals, while others apply standard English rules, and both are understood!
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