Ephemeral (adjective, noun)
(previously 03-10-13)

adjective
1. lasting a very short time; short-lived; transitory: the ephemeral joys of childhood.
2. lasting but one day: an ephemeral flower.

noun
3. anything short-lived, as certain insects.

Synonyms
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1. fleeting, evanescent, transient, momentary, brief.

Antonyms
1. permanent.

Origin: 1570-80; < Greek ephḗmer(os) short-lived, lasting but a day (ep- ep- + hēmér(a) day + -os adj. suffix) + -al

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