Definition of nephridium in English:


nounPlural nephridia

  • (in many invertebrate animals) a tubule open to the exterior which acts as an organ of excretion or osmoregulation. It typically has ciliated or flagellated cells and absorptive walls.

    • ‘Sperm is also released through the nephridium.’
    • ‘Each segment typically contains a pair of nephridia.’
    • ‘The organs they produce include segmental muscles, nephridia, gonads and gonoducts.’
    • ‘Torsion in gastropods has the unfortunate result that wastes are expelled from the gut and nephridia near the gills.’
    • ‘Gametes are shed into the coelom and carried outside the body through the nephridia or as a result of the body wall actually rupturing.’


Late 19th century: modern Latin, from Greek nephrion (diminutive of nephros ‘kidney’) + the diminutive ending -idium.