logy

UK: /ˈləʊgɪ/ US: (lō′gē)

Inflections of 'logy' (adj):

logier

adj comparative

logiest

adj superlative

WordReference Random House Unabridged Dictionary of American English © 2025

lo•gy  (lō′gē), adj., -gi•er, -gi•est. 

1. lacking physical or mental energy or vitality;
   sluggish;
   dull;
   lethargic.

• Dutch log heavy, cumbersome + -y¹
• perh. 1840–50, American.

lo′gi•ly, adv. 
lo′gi•ness, n. 

-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.
• Greek. See -logue, -y³
• Latin -logia
• Middle English -logie

WordReference Random House Learner's Dictionary of American English © 2025

-logy, suffix. 

1. -logy comes from Greek, where it has the meaning "word.'' It is attached to roots to form nouns with the meanings: "field of study, discipline;
   list of'':
   astro- (= star) + -logy → astrology (= study of the influence of stars on events);
   bio- (= life) + -logy → biology (= study of living things).

See -log-.

Collins Concise English Dictionary © HarperCollins Publishers::

-logy combining_form:in_noun:countable

1. indicating the science or study of: musicology
2. indicating writing, discourse, or body of writings: trilogy, phraseology, martyrology

Etymology: from Latin -logia, from Greek, from logos word; see logos

-logical, -logic combining_form:in_adjective

-logist combining_form:in_noun:countable