单词	Hydractinia
释义	Hydractinia noun Hy·​drac·​tin·​ia ˌhīˌdrakˈtinēə : 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 hydractinian ¦⸗ˌ⸗¦tinēən adjective or noun Word History Etymology New Latin, from hydr- + Actinia
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