Cercaria is a term used in biology and refers to the free-swimming larval stage of trematodes. Synonyms for Cercaria include cercarie, cercariform, and cercarian. Cercaria is commonly used to describe the larval form of Schistosoma, a parasitic worm that causes schistosomiasis in humans. Other synonyms include miracidium, metacercariae, and rediae. These synonyms are also used to describe different stages in the life cycle of the trematode. Miracidium refers to the first stage of the life cycle, while metacercariae refers to the encysted stage of the larva. Rediae is another synonym that refers to a stage in the life cycle of some trematode species. These synonyms are essential in describing different stages of trematode species.