One of the mysteries of the English language finally explained.
A branched, blind-ended nephridium containing flame cells (as in flatworms and nemertines) or solenocytes (as in some annelids); a nephridium of this type found in the larvae of other animal groups.
Late 19th century; earliest use found in American Naturalist. From proto- + nephridium, after scientific Latin protonephridium.
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