Definition of trochus
1a capitalized : a genus of chiefly Old World tropical marine gastropods (family Trochidae) with beautifully nacreous bluntly conical shells including a large Indo-Pacific species (T. niloticus) extensively used in making buttons and ornamental objects b plural -es : top shell
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 trochus
New Latin, from Latin, wheel, iron hoop, from Greek trochos wheel — more at troch-
Seen and Heard
What made you want to look up trochus? Please tell us where you read or heard it (including the quote, if possible).