ne·​phrid·​i·​um | \ ni-ˈfri-dē-əm How to pronounce nephridium (audio) \
plural nephridia\ ni-​ˈfri-​dē-​ə How to pronounce nephridia (audio) \

Definition of nephridium

: a tubular glandular excretory organ characteristic of various invertebrates

Other Words from nephridium

nephridial \ ni-​ˈfri-​dē-​əl How to pronounce nephridial (audio) \ adjective

First Known Use of nephridium

1877, in the meaning defined above

History and Etymology for nephridium

New Latin

Keep scrolling for more

Learn More about nephridium

Time Traveler for nephridium

Time Traveler

The first known use of nephridium was in 1877

See more words from the same year

Statistics for nephridium

Cite this Entry

“Nephridium.” Dictionary, Merriam-Webster, Accessed 25 Oct. 2020.

Keep scrolling for more

More Definitions for nephridium


ne·​phrid·​i·​um | \ ni-ˈfrid-ē-əm How to pronounce nephridium (audio) \
plural nephridia\ -​ē-​ə How to pronounce nephridia (audio) \

Medical Definition of nephridium

: an excretory organ that is characteristic of various coelomate invertebrates (as annelid worms, mollusks, brachiopods, and some arthropods), occurs paired in each body segment or as a single pair serving the whole body, typically consists of a tube opening at one end into the coelom and discharging at the other end on the exterior of the body, is often lengthened and convoluted, and has glandular walls

Other Words from nephridium

nephridial \ -​ē-​əl How to pronounce nephridial (audio) \ adjective

More from Merriam-Webster on nephridium Encyclopedia article about nephridium

Comments on nephridium

What made you want to look up nephridium? Please tell us where you read or heard it (including the quote, if possible).


Test Your Vocabulary

Namesakes Word Quiz

  • a citrus fruit possibly named after a person
  • Which of the following is a fruit named after a Moroccan seaport?
Spell It

Can you spell these 10 commonly misspelled words?

Syn City

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!