lo·​gy | \ ˈlō-gē How to pronounce logy (audio) \
variants: or less commonly loggy \ ˈlȯ-​gē How to pronounce loggy (audio) , ˈlä-​ \
logier; logiest

Definition of logy

 (Entry 1 of 2)

Definition of -logy (Entry 2 of 2)

1 : oral or written expression phraseology
2 : doctrine : theory : science ethnology

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Did You Know?

Based on surface resemblance, you might guess that "logy" (also sometimes spelled "loggy") is related to "groggy," but that's not the case. "Groggy" ultimately comes from "Old Grog," the nickname of an English admiral who was notorious for his cloak made of a fabric called grogram - and for adding water to his crew's rum. The sailors called the rum mixture "grog" after the admiral. Because of the effect of grog, "groggy" came to mean "weak and unsteady on the feet or in action." No one is really sure about the origin of "logy," but experts speculate that it comes from the Dutch word log, meaning "heavy." Its first recorded use in English, from an 1847 London newspaper, refers to a "loggy stroke" in rowing.

Examples of logy in a Sentence


the next morning I was feeling logy, having stayed up half the night

First Known Use of logy


1847, in the meaning defined above

History and Etymology for logy


perhaps from Dutch log heavy; akin to Middle Low German luggich lazy

Noun combining form

French -logie, from Latin -logia, from Greek, from logos word

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The first known use of logy was in 1847

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English Language Learners Definition of logy

 (Entry 1 of 2)

US, informal : not able to think or move normally because of being tired, sick, etc.

English Language Learners Definition of -logy (Entry 2 of 2)

: area of knowledge : theory : science
: speech or writing


noun suffix

Kids Definition of -logy

: area of knowledge : science biology

More from Merriam-Webster on logy

Rhyming Dictionary: Words that rhyme with logy

Thesaurus: All synonyms and antonyms for logy

Comments on logy

What made you want to look up logy? Please tell us where you read or heard it (including the quote, if possible).


of or relating to the heavens

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