ephemeral
Cross references: 1. transient 1. ephem.er.al \i-'fem-(*-)r*l\ \-e-\ aj [Gk ephe-meros lasting a day, daily, fr. epi- + he-mera] day 1: lasting one day only 2: lasting a very short time - ephem.er.al.ly av 2. ephemeral n : something ephemeral; specif : a plant that grows, flowers, and d ies in a few days