from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A mayfly, especially one of the family Ephemeridae.
from The Century Dictionary.
- noun In entomology, an insect of the family Ephemeridæ.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun zoology Any member of the Ephemeridae.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun short-lived insect
from The American Heritage® Dictionary of the English Language, 4th Edition
Those who play a waiting game have matters more in their own hands, time gives them double chances; whereas if success does not come at once to the ephemerid he misses it altogether.
In fact, it's quite normal for Dutch scientific terminology to occur in pairs composed of a "difficult" and a homier variant: ephemerid can be translated as efemeride or as eendagsvlieg