: a compound with seven molecules of water. What words start with Hepta? 9-letter words that start with hepta heptarchy. heptagons. heptarchs. heptaglot. heptapody. heptanone. heptacene. heptagram. What OCTA means? Octa- is a combining form used like a prefix meaning “eight.” It is often used in a great many scientificRead More →