Origin of logy

1840–50, Americanism; perhaps < Dutch log heavy, cumbersome + -y1
Related formslo·gi·ly, adverblo·gi·ness, noun


  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 of -logy

Middle English -logie < Latin -logia < Greek. See -logue, -y3
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for logy

Historical Examples of logy

  • Besides all this, the water was warm; the trout were logy and would not rise.

    Wood Folk at School

    William J. Long

  • She is light gaited, not long and logy in her movements, and carries her own head.

    Patroclus and Penelope

    Theodore Ayrault Dodge

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


    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

  • She was logy, at times, and hated to start; but once you got her going you had a proper job to stop her.

    Their Son; The Necklace

    Eduardo Zamacois

British Dictionary definitions for logy


adjective logier or logiest
  1. mainly US dull or listless
Derived Formsloginess, noun

Word Origin for logy

C19: perhaps from Dutch log heavy


n combining form
  1. indicating the science or study ofmusicology
  2. indicating writing, discourse, or body of writingstrilogy; phraseology; martyrology
Derived Forms-logical or -logic, adj combining form-logist, n combining form

Word Origin for -logy

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

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

logy in Medicine


  1. Science; theory; study:dermatology.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.