ephemeron Meaning, Definition & Usage

  1. noun anything short-lived, as an insect that lives only for a day in its winged form
    ephemeral.

WordNet

E*phem"e*ron noun
Etymology
NL. See Ephemera.
Wordforms
plural Ephemera
Definitions
  1. (Zoöl.) One of the ephemeral flies.

Webster 1913