English

pronephros

From pro- + nephros.

A compound of pro- + nephros

Proto-Indo-European *pér ‘through’

Proto-Indo-European *pró ‘forwards, before’

Proto-Italic *prō ‘in front of, before’

Latin prō ‘in favor of, on behalf of’

English pro-

Proto-Indo-European *negʷʰrós ‘kidney’

Proto-Hellenic *nekʷʰrós ‘kidney’

Ancient Greek νεφρός ‘kidney’

Today it means

noun A primitive kidney in the lamprey and similar animals, and in other vertebrate embryos

Language periods are conventional ranges, not dates for this word.

Etymograph / pronephros