ˌhīˌdrakˈtinēə noun
Usage: capitalized
Etymology: New Latin, from hydr- + Actinia
: a genus of marine hydroids that have separate and distinctive polyps for nutritive, reproductive, and defensive functions borne on a dense encrusting coenosarc and that are commonly associated with shells containing hermit crabs
• hy·drac·tin·i·an | ̷ ̷ˌ ̷ ̷|tinēən adjective or noun