) KEY NOUN: pl. pro·neph·roi
- 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.
+ Greek nephros
, kidneyOTHER FORMS:pro·nephric
k) KEY (Adjective)