ctenidium

noun
cte·​nid·​i·​um | \ -ēəm \
plural ctenidia\ -​ēə \

Definition of ctenidium

1 : the gill of a mollusk consisting typically of a respiratory structure that resembles a comb or feather, has a main stem with lateral lamellae, and is developed from the inner side of the mantle distinguished from ceras
2 : a structure consisting of a row of spines resembling the teeth of a comb on the head or thorax, or both, of certain fleas

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

History and Etymology for ctenidium

New Latin, from cten- + -idium

Keep scrolling for more

Learn More about ctenidium

Statistics for ctenidium

Cite this Entry

“Ctenidium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ctenidium. Accessed 24 Jan. 2021.

Comments on ctenidium

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

WORD OF THE DAY

Test Your Vocabulary

Slippery Words Quiz—Changing with the Times

  • ducreux self portrait yawning
  • What is an earlier meaning of nice?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Typeshift

Anagram puzzles meet word search.

TAKE THE QUIZ
Love words? Need even more definitions?

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