Medical Definition of Head kidney

1. 1. The definitive excretory organ of primitive fishes. Synonym: head kidney. 2. In the embryos of higher vertebrates, a vestigial structure consisting of a series of tortuous tubules emptying into the cloaca by way of the primary nephric duct; in the human embryo, the pronephros is a very rudimentary and temporary structure, followed by the mesonephros and still later by the metanephros. Synonym: forekidney, primordial kidney. Origin: pro-+ G. Nephros, kidney (05 Mar 2000)

Lexicographical Neighbors of Head Kidney

head cap
head cavity
head cold
head count
head covering
head crash
head fold
head for the hills
head game
head gasket
head gate
head home
head honcho
head injuries
head injury
head kidney (current term)
head lettuce
head lice
head lice
head linesman
head louse
head mirror
head movements
head nurse
head nurse
head off
head of epididymis
head of femur
head of fibula
head of hair

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