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-logy — Definition and Word History
- AUTHOR / EDITOR
- Merriam-Webster Editors
- YEAR
- 2026
- PUBLISHER
- Merriam-Webster
- DOI
- Not recorded
- SOURCE TYPE
- historical dictionary
- EXTERNAL RECORD
- OPEN ORIGINAL ↗
CONTRARIAN TRUTH CLAIMS
RANKED REVEALS THAT CITE THIS SOURCE
-logy never simply meant “the study of.”
The bound form’s recorded range includes expression and discourse as well as doctrine, theory, science, and study. Its trail reaches Greek logos—word, speech, account, reckoning, reason—rather than a prehistoric word meaning “science.”
*leǵ- → λέγω → λόγος → -λογία → -logia → -logie → -logie → -logy
Definitions 1–2 and EtymologyPublishes the multi-sense combining form and its Greek logos ancestry.
SCHOLARLY DISAGREEMENT
DISPUTE POSITIONS THAT CITE THIS SOURCE
Does -logy simply mean “the study of”?
No. Merriam-Webster gives oral or written expression as one sense and doctrine, theory, or science as another; American Heritage separately gives discourse or expression and science, theory, or study. “Study of” is a useful reading in many formations, not a universal historical definition.
Definitions 1–2Publishes expression and discourse beside doctrine, theory, and science.
Was -logy a freestanding ancestral word?
No evidence reviewed here supports that representation. Merriam-Webster calls -logy a noun combining form and explains that a hyphenated entry is a word element forming part of a compound; the historical forms are likewise evidenced within larger formations. The unrelated adjective logy “sluggish” has a different history.
Separate adjective and noun combining-form entriesDistinguishes unrelated sluggish logy from the bound learned element.
CANONICAL RELATIONSHIP CLAIMS
EDGES THAT CITE THIS SOURCE
-logy → -logie
Present-Day English → Middle English · historical continuation
- SOUND
- Middle English -logie is continued by modern English -logy with spelling and pronunciation adapted to later English patterns.
- MEANING
- The learned form remains productive across expression, discourse, doctrine, theory, science, and study senses rather than narrowing to one universal gloss.
- SCHOLAR / EDITOR
- American Heritage Dictionary Editors · Merriam-Webster Editors
Definitions 1–2Documents the modern expression, doctrine, theory, and science range.
-logia → -λογία
Latin → Ancient Greek · borrowing
- SOUND
- Latin -logia borrows and transliterates Greek -logiā.
- MEANING
- A Greek formation in the speaking and account family becomes a reusable learned Latin element.
- SCHOLAR / EDITOR
- American Heritage Dictionary Editors · Merriam-Webster Editors
Etymology: French -logie, Latin -logia, Greek, from logosIndependently publishes the French, Latin, and Greek sequence in compressed form.
LEXICAL ATTESTATIONS
WITNESSES REPORTED BY THIS SOURCE
-logy
Merriam-Webster noun combining-form entry
OPEN WITNESS 206 ↗COMPARATIVE EVIDENCE
COGNATES, DESCENDANTS, AND RELATIVES
GEOGRAPHIC AND TEMPORAL CLAIMS
JOURNEY STAGES THAT CITE THIS SOURCE
Latin learned networks
Independently identifies the Latin learned form.
Etymology: Latin -logia · broadGlobal English
Documents the current combining-form range.
Definitions 1–2 · globalNON-GENEALOGICAL CONNECTIONS
HISTORICAL CONTEXT, KEPT SEPARATE
WORD-FAMILY REUSE
DOSSIERS THAT DEPEND ON THIS SOURCE
2 entry-scoped citations map reviewed dossier paths onto the canonical claims above.