Gerontological

[jer-uhn-tol-uh-jee, jeer-]

ger·on·tol·o·gy

[jer-uhn-tol-uh-jee, jeer-]
noun
the branch of science that deals with aging and the problems of aged persons.

Origin:
1900–05; geronto- + -logy

ge·ron·to·log·i·cal [juh-ron-tl-oj-i-kuhl] , adjective
ger·on·tol·o·gist, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Gerontological is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a chattering or flighty, light-headed person.
Collins
World English Dictionary
gerontology (ˌdʒɛrɒnˈtɒlədʒɪ)
 
n
Compare geriatrics the scientific study of ageing and the problems associated with older people
 
gerontological
 
adj
 
geron'tologist
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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