Word Origin See more synonyms for -logy on Thesaurus.com a combining form used in the names of sciences or bodies of knowledge: paleontology; theology. a termination of nouns referring to writing, discourses, collections, etc.: trilogy; martyrology. Origin of -logy Middle English -logie
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for -logy indicating the science or study of musicology indicating writing, discourse, or body of writings trilogy; phraseology; martyrology Derived Forms -logical or -logic, adj combining form -logist, n combining form Word Origin
-logia, from Greek, from logos word; see logos
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Word Origin and History for -logy
word-forming element meaning "a speaking, discourse, treatise, doctrine, theory, science," from Greek
-logia (often via French -logie or Medieval Latin -logia), from root of legein "to speak;" thus, "the character or deportment of one who speaks or treats of (a certain subject);" see lecture (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
-logy Science; theory; study: dermatology.
The American Heritage® Stedman's Medical Dictionary
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