We found one dictionary that defines the word pentathlos:

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1. pentathlos: Wiktionary

Definitions from Wiktionary (pentathlos) ▸ noun:  (obsolete) A pentathlete. ▸ Words similar to pentathlos ▸ Usage examples for pentathlos ▸ Idioms related to pentathlos ▸ Wikipedia articles (New!) ▸ Popular adjectives describing pentathlos ▸ Words that often appear near pentathlos ▸ Rhymes of pentathlos ▸ Invented words related to pentathlos