ephemerid

From translingual Ephemeridae, from New Latin ephemerus, from Ancient Greek ἐφήμερος (ephḗmeros), the more common form of ἐφημέριος (ephēmérios, “of, for, or during the day, living or lasting but for a day, short-lived, temporary”), from ἐπί (epí, “on”) + ἡμέρα (hēméra, “day”).

ephemerid (plural ephemerids)

1. Any mayfly in the family Ephemeridae.
   • 1976 September, Saul Bellow, Humboldt’s Gift, New York, N.Y.: Avon Books, →ISBN, page 51:

     I had flown in a helicopter with Javits and Bobby Kennedy. I was skirring around New York like an ephemerid, my jacket lined with jolly psychedelic green.

• ephemeris