Ephemeridae
plural noun
Eph·e·mer·i·dae
| \ -əˌdē \
Definition of Ephemeridae
: a family of large mayflies that include forms having shining transparent wings as adults and as nymphs very large mandibles curved out at the tips, feathered gills extending over the body, and enlarged front legs adapted for digging in stream and lake bottoms
Test Your Vocabulary
Words Named After People
-
- Namesake of the leotard, Jules Léotard had what profession?

Test your knowledge - and maybe learn something along the way.
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Share Ephemeridae