Learn how to say Ephemera correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word ephemera:
(plural) -eras, -erae (-əˌriː)
a mayfly, esp one of the genus Ephemera
something transitory or short-lived
(functioning as plural) a class of collectable items not originally intended to last for more than a short time, such as tickets, posters, postcards, or labels
a plural of ephemeron