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senile

[see-nahyl, -nil, sen-ahyl] /ˈsi naɪl, -nɪl, ˈsɛn aɪl/
adjective
1.
showing a decline or deterioration of physical strength or mental functioning, especially short-term memory and alertness, as a result of old age or disease.
2.
of or belonging to old age or aged persons; gerontological; geriatric.
3.
Physical Geography. (of topographical features) having been reduced by erosion to a featureless plain that stands everywhere at base level.
Compare peneplain.
noun
4.
a senile person.
Origin
1655-1665
1655-65; < Latin senīlis old, equivalent to sen(ex) old man (akin to senior) + -īlis -ile
Related forms
unsenile, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un senile

senile

/ˈsiːnaɪl/
adjective
1.
of, relating to, or characteristic of old age
2.
mentally or physically weak or infirm on account of old age
3.
(of land forms or rivers) at an advanced stage in the cycle of erosion See old (sense 18)
Derived Forms
senilely, adverb
senility (sɪˈnɪlɪtɪ) noun
Word Origin
C17: from Latin senīlis, from senex an old man
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for un senile
senile
1661, "suited to old age," from Fr. sénile, from L. senilis "of old age," from senex (gen. senis) "old, old man," from PIE base *sen- "old" (cf. Skt. sanah "old;" Avestan hana- "old;" O.Pers. hanata- "old age, lapse of time;" Armenian hin "old;" Gk. enos "old, of last year;" Lith. senas "old," senis "an old man;" Goth. sineigs "old" (used only of persons), sinistra "elder, senior;" O.N. sina "dry standing grass from the previous year;" O.Ir. sen, O.Welsh hen "old"). Meaning "weak or infirm from age" is first attested 1848.
Online Etymology Dictionary, © 2010 Douglas Harper
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un senile in Medicine

senile se·nile (sē'nīl', sěn'īl')
adj.

  1. Relating to, characteristic of, or resulting from old age.

  2. Exhibiting the symptoms of senility, as impaired memory or the inability to perform certain mental tasks.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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