[ephem.er.al] adj [Gk ephemeros lasting a day, daily, fr. epi- + hemera day] (1576) 1: lasting one day only "an ~ fever"
2: lasting a very short time "~ pleasures" syn see transient -- ephem.er.al.ly adv
[2]ephemeral n (1817): something ephemeral; specif: a plant that grows, flowers, and dies in a few days