Definition of protonephridium in English:

protonephridium

noun

Zoology
  • 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.

Origin

Late 19th century; earliest use found in American Naturalist. From proto- + nephridium, after scientific Latin protonephridium.

Pronunciation

protonephridium

/ˌprəʊtə(ʊ)nɪˈfrɪdɪəm/