ephemera

ephemera |ɪˈfɛm(ə)rə, -ˈfiːm-|

pluralnoun

things that exist or are used or enjoyed for only a short time. there were papers, letters, old boxes—all sorts of ephemera.

ORIGIN late 16th cent.: plural of ephemeron, from Greek, neuter of ephēmeros ‘lasting only a day’. As a singular noun the word originally denoted a plant said by ancient writers to last only one day, or an insect with a short lifespan, and hence was applied (late 18th cent.) to a person or thing of short-lived interest. Current use has been influenced by plurals such as trivia and memorabilia.