-logy

-logy

1.
a combining form used in the names of sciences or bodies of knowledge: paleontology; theology.
2.
a termination of nouns referring to writing, discourses, collections, etc.: trilogy; martyrology.

Origin:
Middle English -logie < Latin -logia < Greek. See -logue, -y3

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
-logy
 
n combining form
1.  indicating the science or study of: musicology
2.  indicating writing, discourse, or body of writings: trilogy; phraseology; martyrology
 
[from Latin -logia, from Greek, from logos word; see logos]
 
-logical
 
adj combining form
 
-logic
 
adj combining form
 
-logist
 
n combining form

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

-logy
"a speaking, discourse, treatise, doctrine, theory, science," from Gk. -logia (often via Fr. -logie or M.L. -logia), from root of legein "to speak;" thus, "the character or department of one who speaks or treats of (a certain subject);" see lecture.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

-logy suff.
Science; theory; study: dermatology.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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