Medical Dictionary


noun pro·neph·ros \(ˈ)prō-ˈnef-rəs, -ˌräs\
plural pro·neph·roi \-ˌri\

Medical Definition of PRONEPHROS

:  either member of the first and most anterior pair of the three paired vertebrate renal organs that functions in the adults of amphioxus and some lampreys, functions temporarily in larval fishes and amphibians, and is present but nonfunctional in embryos of reptiles, birds, and mammals—compare mesonephros, metanephros


How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears