troch·o·zoa \ˌträkəˈzōə\noun plural Usage: capitalized Etymology: New Latin, from troch- + -zoa in some especially former classifications: a group of Invertebrata including all those (as the annelids and mollusks) whose early larval stage is normally a trochophore • troch·o·zo·ic\| ̷ ̷ ̷ ̷|zōik\adjective