Etymology
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Words related to pediatrics

pediatric (adj.)

"of or pertaining to the medical care or diseases of children," 1849, from Latinized form of Greek paid-, stem of pais "child" (see pedo-) + -iatric.

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-ics 
in the names of sciences or disciplines (acoustics, aerobics, economics, etc.), a 16c. revival of the classical custom of using the neuter plural of adjectives with Greek -ikos "pertaining to" (see -ic) to mean "matters relevant to" and also as the titles of treatises about them. Subject matters that acquired their English names before c. 1500, however, tend to be singular in form (arithmetic, logic, magic, music, rhetoric). The grammatical number of words in -ics (mathematics is/mathematics are) is a confused question.
geriatrics (n.)
coined 1909 by Austrian-born doctor Ignatz L. Nascher (1863-1944) in "New York Medical Journal" on the model of pediatrics from geriatric (q.v.). Also see -ics. The correct formation would be gerontiatrics.