HENDECAGON Meaning of HENDECAGON in English [ hɛn'dɛkəg(ə)n ]■ noun a plane figure with eleven straight sides and angles.Derivatives~al ˌhɛndɪ'kag(ə)n(ə)l adjective Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004