We found one dictionary that defines the word hextuplet:

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1. hextuplet: Wiktionary

Definitions from Wiktionary (hextuplet) ▸ noun:  Synonym of sextuplet ▸ Words similar to hextuplet ▸ Usage examples for hextuplet ▸ Idioms related to hextuplet ▸ Wikipedia articles (New!) ▸ Popular adjectives describing hextuplet ▸ Words that often appear near hextuplet ▸ Rhymes of hextuplet ▸ Invented words related to hextuplet