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From Biology-Online Dictionary | Biology-Online Dictionary
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Cush (for sush) to dry, to wither, Zend hush to dry. Cf. Austere, Sorrel] Dry; withered; no longer green; applied to leaves. I have lived long enough; my way of life Is fall'n into the sear, the yellow leaf. (Shak)

Origin: OE. Seer, AS. Sear (assumed) fr. Searian to wither; akin to D. Zoor dry, LG. Soor, OHG. Soren to to wither, Gr. To parch, to dry, Skr. (used especially of vegetation) having lost all moisture; dried-up grass; the desert was edged with sere vegetation; shriveled leaves on the unwatered seedlings; withered vines.Plant succession, as in the instance of a [[hydrosere, a type of plant which colonises the banks of aquatic communities.