IPA: /nɛˈfrɪdiəm/
KK: /nɛˈfrɪdiəm/
A tube-like organ found in some invertebrates that helps remove waste from the body.
The earthworm uses its nephridia to filter out waste from its body.
Nephridium → It is formed from "nephros" (Greek, meaning kidney) and the suffix "-idium" (diminutive suffix in Latin, meaning small). The word "nephridium" refers to a small kidney-like structure, typically found in invertebrates, that functions in excretion.
Think of 'nephros' meaning kidney, and remember that a 'nephridium' is a small structure that functions like a kidney.