wiktionary
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From Ancient Greek γυνή(gunḗ, “woman”) (genitive form γυναικός) + -λογία(-logía, “branch of study”), itself the combination form of -λόγος(-lógos, “word, knowledge, reason”) .
etymonline
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gynecologist (n.)
also gynaecologist, 1851, from gynecology + -ist.
