ephemerid

noun
ephem·​er·​id | \ i-ˈfe-mə-rəd How to pronounce ephemerid (audio) \

Definition of ephemerid

: mayfly

First Known Use of ephemerid

1872, in the meaning defined above

History and Etymology for ephemerid

ultimately from Greek ephēmeron

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The first known use of ephemerid was in 1872

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