D defs.my
Entry 2 senses Webster, 1913

Ephemera

· E·phem·e·ra · IPA /ɪˈfɛməɹə/
01 n. A fever of one day's continuance only.
  1. 1.
    A fever of one day's continuance only.(Med.)
  2. 2.
    A genus of insects including the day flies, or ephemeral flies. See Ephemeral fly, under Ephemeral.(Zoöl.) See: Ephemeral