Definition of pronephros

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perfunctory
Definition: (adjective) unenthusiastic, routine, or mechanical.
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pro·neph·ros  audio  (pr-nfrs, -rs) KEY 

NOUN:
pl. pro·neph·roi  (-roi) KEY  or pro·neph·ra  (-r) KEY 
A kidneylike organ, being either part of the most anterior pair of three pairs of organs in a vertebrate embryo, disappearing early in the embryonic development of higher vertebrates, but functioning as a kidney in some simple vertebrates, such as the lamprey.
ETYMOLOGY:
pro-2 + Greek nephros, kidney

OTHER FORMS:
pro·nephric  (-rk) KEY (Adjective)


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