Definition of mixonephridium in US English:

mixonephridium

noun

Zoology
  • In many polychaetes: a combined nephridium and coelomoduct in which the coelomic end of the nephridium is completely fused with the coelomostome.

Origin

1940s. From mixo- + nephridium. Compare earlier nephromixium, protonephridium, metanephridium.

Pronunciation

mixonephridium

/ˌmɪksəʊnɪˈfrɪdɪəm/