Definition of -logy in English:

-logy

combining form

1 (usually as -ology) Denoting a subject of study or interest: psychology
2Denoting a characteristic of speech or language: eulogy
2.1Denoting a type of discourse: trilogy

Origin

from French -logie or medieval Latin -logia, from Greek.

Definition of -logy in:

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Word of the day hubris
Pronunciation: ˈhjuːbrɪs
noun
excessive pride or self-confidence