one of the three embryonic excretory organs of vertebrates, which becomes the functional kidney of certain primitive fishes.
- pro·neph·ric [proh-nef-rik], /proʊˈnɛf rɪk/, adjective
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How to use pronephros in a sentence
The head and even the region of the pronephros are clearly separate from the yolk-sac; the mouth is coming to be formed.A Guide to the Study of Fishes, Volume 1 (of 2) | David Starr Jordan
The great distinction of the pronephros is that it, and it alone, forms the segmental duct.The Origin of Vertebrates | Walter Holbrook Gaskell
It is clear from the above description that there is no trace of head-kidney or pronephros visible in the adult.
The pronephros is placed, as can be made out in later stages, on the level of the opening of the air-bladder into the throat.
It may be noted that in Lepidosteus the whole pronephros has exactly the character of a single segmental tube of the mesonephros.
British Dictionary definitions for pronephros
- pronephric, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012