ephemerid

[ ih-fem-er-id ]

/ ɪˈfɛm ər ɪd /

an insect of the order Ephemeroptera, comprising the mayflies.

Also called ephemeropteran.

Origin of ephemerid

From the New Latin word Ephemeridae, dating back to 1870–75. See ephemeral, -id²

In the Ephemerid they lie in planes approaching the vertical, slightly diverging from each other towards their extremities.

Old Flies in New Dresses |Charles Edward Walker
Those examples are provided by Rotifera (inferior worms) and by Ephemerid.

Life of Elie Metchnikoff, 1845-1916 |Olga Metchnikoff
The name of the family to which they belong, Ephemerid, suggests their ephemeral existence.

Cornell Nature-Study Leaflets |Various
They are like the Ephemerid insects which live for a summer day only.

The Romance of Plant Life |G. F. Scott Elliot

I do not propose in this work to deal with Ephemerid, as the wings in the imitations now sold are in the natural position.

Old Flies in New Dresses |Charles Edward Walker

ephemerid

/ (ɪˈfɛmərɪd) /

any insect of the order Ephemeroptera (or Ephemerida), which comprises the mayflies Also called: ephemeropteran

C19: from New Latin Ephēmerida, from Greek ephēmeros short-lived + -id ²