hydrobiology

noun

Etymology: Etymology tree Ancient Greek ῠ̔δρο- (hŭdro-)der. English hydro- Proto-Indo-European *gʷeyh₃-der. Ancient Greek βίος (bíos) Ancient Greek -λογῐ́ᾱ (-logĭ́ā)bor. New Latin -logia New Latin biologialbor. English biology English hydrobiology From hydro- + biology.

1. The study of the biology of the organisms that inhabit bodies of water.