also gynaecology, "science of women's health and of the diseases peculiar to women," 1847, from French gynécologie, from Latinized form of Greek gynaiko-, combining form of gynē "woman, female," from PIE root *gwen- "woman." Second element is from French -logie "study of," from Greek (see -logy). Another word for it was gyniatrics.
compound adjectival word-forming element, usually interchangeable with -ic but sometimes with specialized sense (such as historic/historical, politic/political), Middle English, from Late Latin -icalis, from Latin -icus + -alis (see -al (1)). Probably it was needed because the forms in -ic often took on a noun sense (for example physic). Forms in -ical tend to be attested earlier in English than their twins in -ic.
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Harper, D. (n.d.). Etymology of gynecological. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/gynecological