Main Entry: pro·cer·coid Pronunciation: (')prO-'s&r-"koid Function: noun : the solid first parasitic larva of some tapeworms that developsusually in the body cavity of a copepod
procercoid pro·cer·coid (prō-sûr'koid) n. The first stage in the aquatic life cycle of certain tapeworms following ingestion of the newly hatched larva by a copepod.