[proh-nef-ros, -ruhs]
noun, plural pronephroi [proh-nef-roi] , pronephra [proh-nef-ruh] . Embryology.
one of the three embryonic excretory organs of vertebrates, which becomes the functional kidney of certain primitive fishes.

1875–80; < Neo-Latin < Greek pro- pro-2 + nephrós kidney

pronephric [proh-nef-rik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pronephros (prəʊˈnɛfrɒs)
n , pl -roi, -ra
mesonephros See also metanephros the first-formed anterior part of the embryonic kidney in vertebrates, which remains functional in the larvae of the lower vertebrates
[C19: New Latin, from pro-² + Greek nephros kidney]

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American Heritage
Medical Dictionary

pronephros pro·neph·ros (prō-něf'rəs, -rŏs')
n. pl. pro·neph·roi (-roi) or pro·neph·ra (-rə)
A kidneylike organ, being either part of the most anterior pair of three pairs of organs in a vertebrate embryo, usually disappearing early in embryonic development.

The American Heritage® Stedman's Medical Dictionary
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