Definition of thyridium
1 : a pale spot in the wing vein of some insects especially of the orders Hymenoptera and Trichoptera
2 : one of a pair of oval pits on the second abdominal tergite of some hymenopterans
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 thyridium
New Latin, from Greek thyridion window, diminutive of thyra door
Seen and Heard
What made you want to look up thyridium? Please tell us where you read or heard it (including the quote, if possible).