trochophore Syllabification: (troch·o·phore)Pronunciation: /ˈträkəˌfôr/Definition of trochophore noun Zoology the planktonic larva of certain invertebrates, including some mollusks and polychaete worms, having a roughly spherical body, a band of cilia, and a spinning motion. Origin: late 19th century: from Greek trokhos 'wheel' + -phoretrochophore in other Oxford dictionaries Definition of trochophore in the British & World English dictionary