ammocoete

/ ˈæməˌsiːt /

noun

1. the larva of primitive jawless vertebrates, such as the lamprey, that lives buried in mud and feeds on microorganisms

Word History and Origins

Origin of ammocoete¹

C19: from New Latin ammocoeteēs, literally: that lie in sand, from Greek ammos sand + koitē bed, from keisthai to lie