noun pl. ephemera or ephemerons
Origin: Gr ephēmeron, short-lived insect < ephēmeros, for the day, short-lived < epi-, upon + hēmera, day
See ephemeron in American Heritage Dictionary 4
noun pl. e·phem·er·a (-ər-ə) or e·phem·er·ons
Origin:
Origin: Greek ephēmeron, mayfly
Origin: , from
Origin: neuter of ephēmeros, daily, short-lived; see ephemeral
.Learn more about ephemeron