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!
Origin and Etymology of ctenidium
New Latin, from cten- + -idium
Seen and Heard
What made you want to look up ctenidium? Please tell us where you read or heard it (including the quote, if possible).