Definition of ephemeron in English:

ephemeron

Syllabification: e·phem·er·on
Pronunciation: /iˈfeməˌrän
 
/

noun (plural ephemerons)

An insect that lives only for a day or a few days.

Origin

from Greek, neuter of ephēmeros 'lasting only a day'.

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Word of the day setose
Pronunciation: ˈsiːtəʊs
adjective
bearing bristles or setae; bristly