21-gon

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    Synonym of icosihenagon: A polygon with twenty-one edges and twenty-one angles.

Synonyms

All synonyms
icosihenagon

Etymology

From 21 + -gon.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.