/i fem"euh ron', -euhr euhn/ , n. , pl. ephemera /-euhr euh/ , ephemerons .
1. anything short-lived or ephemeral.
2. ephemera , items designed to be useful or important for only a short time, esp. pamphlets, notices, tickets, etc.
[ 1570-80; ephémeron short-lived insect, n. use of neut. of ephémeros; see EPHEMERAL ]