I. ə̇ˈfem(ə)rə noun
Etymology: New Latin, from Greek ephēmerē, feminine of ephēmeros
1.
a. capitalized : a genus (the type of the family Ephemeridae) of mayflies with shining transparent wings and strong functional legs
b. plural ephemeras -rəz or ephemer·ae -məˌrē : mayfly , ephemerid
2. plural ephemeras or ephemerae : ephemeral II
II.
plural of ephemeron
III. noun plural
Etymology: ephemera (II)
: paper items (as posters, broadsides, or tickets) that were originally meant to be discarded after use but have since become collectibles