IPA: /sɜːrˈkeəriə/
KK: /sɜrˈkɛr i ə/
A type of larval stage of a parasitic worm that is free-swimming and typically develops in a snail before moving to another host.
The cercaria swims through the water to find its next host.
Cercaria → The word 'cercaria' comes from the Greek 'kērkos' ("κέρκος", meaning tail) and the suffix '-aria' (meaning pertaining to). It refers to a larval stage of certain parasitic flatworms that have a tail-like structure.
Imagine a tiny creature with a 'tail' ('kērkos') that is 'pertaining to' a specific stage in its life cycle — that's what cercaria means.