metanephros
an organ similar to a kidney found in some adult fish:
The pronephros is the functional kidney in only the lowest of vertebrates.
The pronephros is a temporary structure, and was present soon after hatching.
The pronephros appears in the fourth week of development.
The pronephros functions in the larval stages of amphibians and fish, but not in mammals after birth.

SMART Vocabulary: related words and phrases

Substances & structures in the body
abductor
accessorius
ACL
actin
adductor
fundus
funiculus
fusiform
glomerular
glomerulus
myosin
navicular
neuroendocrine
neurohormonal
neurohormone
tendinous
tendinum
tendo
tensor
Th

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