DEFINITION of -logy

forms nouns: log--y - study, science, the study or science of


ETYMOLOGY of -logy

greek

ComponentOriginMeaning
log- / logo-Greek λόγος (logos), from λέγειν (legein)“study,” “science,” “the study or science of” — Noun-forming suffix — “the branch of knowledge or science dealing with (a named subject)”

The suffix entered English in the 1550s as etymology (noun), borrowed from French étymologie, from Late Latin aetymologia, from Greek ἐτυμολογία (etymologia) — literally “the science of the true meaning” (etos “true” + logos “word, study”). The modern medical use of -logy as a productive suffix proliferated in the 1800s. The root logos (“word, study, reason”) connects -logy to the entire study and science suffixes: pathology (path- + logy the study of disease), cardiology (cardio- + logy the study of the heart), and neurology (neuro- + logy the study of the nervous system). The noun-forming suffix -logy is one of the most productive suffixes in medical terminology: e.g., pharmacology, toxicology, hematology, nephrology, and radiology.


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