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ephemeron

noun
ephem·​er·​on | \ ə̇ˈfeməˌrän\
plural ephemera\ -​m(ə)rə \ also ephemerons\ -​məˌränz \

Definition of ephemeron

1 : ephemerid
2 : ephemeral entry 2

History and Etymology for ephemeron

New Latin, from Greek ephemēron May fly, from neuter of ephemēros lasting a day, short-lived, daily

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