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[loh-gee] /ˈloʊ gi/
adjective, logier, logiest.
lacking physical or mental energy or vitality; sluggish; dull; lethargic.
Origin of logy
1840-50, Americanism; perhaps < Dutch log heavy, cumbersome + -y1
Related forms
logily, adverb
loginess, noun


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.
Middle English -logie < Latin -logia < Greek. See -logue, -y3 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for logy
Historical Examples
  • The canvas is rather a logy, limp sort of craft, to my thinking, and liable to drown her crew if swamped.

    Woodcraft and Camping George Washington Sears (Nessmuk)
  • Besides all this, the water was warm; the trout were logy and would not rise.

    Wood Folk at School William J. Long
  • These scows weigh tons, you know, and get logy in the bargain from being so long in the water.

  • Tony thinks that Americans eat too much that is sweet; it makes them logy and sleepy.

    Steel Charles Rumford Walker
  • The cattle were lazy and logy from water, often admitting of riding within a rod, thus rendering the brands readable at a glance.

    Wells Brothers Andy Adams
  • The more the air presses upon us the lighter we feel, and the less it presses upon us the more "logy" we feel.

    Under the Maples John Burroughs
  • In the streams it is a gamer fish than in lakes, though the larger fish are rather lazy and logy.

    Favorite Fish and Fishing James Alexander Henshall
  • Her petulant sister and the logy Luella never dreamed that Aunt Crete desired such un-auntly indulgences.

    Aunt Crete's Emancipation Grace Livingston Hill
  • In the shifting breeze it swayed sluggishly, heavily, as if riding at anchor like a logy ship of the air.

    The Mystery Stewart Edward White and Samuel Hopkins Adams
  • The child begins to cry and then soon goes off into a deep sleep, while the body seems more heavy and logy than usual.

    The Mother and Her Child William S. Sadler
British Dictionary definitions for logy


adjective logier, logiest
(mainly US) dull or listless
Derived Forms
loginess, noun
Word Origin
C19: perhaps from Dutch log heavy


combining form
indicating the science or study of: musicology
indicating writing, discourse, or body of writings: trilogy, phraseology, martyrology
Derived Forms
-logical, -logic, combining_form:in_adjective
-logist, combining_form:in_noun:countable
Word Origin
from Latin -logia, from Greek, from logos word; see logos
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for logy

"dull and heavy," 1848, American English, perhaps from Dutch log "heavy, dull" + -y (2); cf. Middle Low German luggich "sleepy, sluggish." Or perhaps a variant of loggy.


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
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logy in Medicine

-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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