ephemeral

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ephemeral

Biology
1. a short-lived organism, such as the mayfly
2. a plant that completes its life cycle in less than one year, usually less than six months
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

ephemeral

Temporary. Fleeting. Transitory. See ephemeral message app.
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References in periodicals archive ?
This is much more charcoal than might be expected in an ephemeral lake basin which, the excavators say, was only intermittently available for camping.
Lake Cowal is an ephemeral lake, being completely dry for 20% to 30% of the time and about 105 [km.sup.2] in area when full.