senile

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senile

(of land forms or rivers) at an advanced stage in the cycle of erosion
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

senile

[′sē‚nīl]
(geology)
Pertaining to the stage of senility of the cycle or erosion.
(medicine)
Of, pertaining to, or caused by the aging process or by the infirmities of old age.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.