*SET-U

English word origin

Etymology of -onium

Etymology tree English onium English -on Proto-Indo-European *-(i)yós Proto-Italic *-ijos Proto-Italic *-ios Old Latin -ios Latin -iusnom. Latin -iumlbor. English -ium English -onium From onium or -on + -ium.

2 source sectionsExtended source reportWiktionary original ↗
In this entry · 2 source sections

The source etymologies

Wiktionary via Kaikki / Wiktextract

The source reports below are imported and unreviewed by *SET-U. Separate numbered origins and differing source variants are preserved; agreement within this extraction is not independent corroboration.

Source etymology 1

Original entry ↗
suffix

Designating an onium particle.

Selected source glosses provide context, not a complete modern definition inventory

Etymology tree English onium English -on Proto-Indo-European *-(i)yós Proto-Italic *-ijos Proto-Italic *-ios Old Latin -ios Latin -iusnom. Latin -iumlbor. English -ium English -onium From onium or -on + -ium.

Inspect preserved source fields

Raw extraction fields are retained for auditing. Their order does not establish ancestry.

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      "args": {
        "1": "en",
        "2": "onium<id:from-pattern-whence-muonium_s-name>",
        "3": ":af",
        "4": "-on<id:particle>",
        "5": "-ium",
        "id": "particle physics",
        "tree": "1"
      },
      "expansion": "Etymology tree\nEnglish onium\nEnglish -on\nProto-Indo-European *-(i)yós\nProto-Italic *-ijos\nProto-Italic *-ios\nOld Latin -ios\nLatin -iusnom.\nLatin -iumlbor.\nEnglish -ium\nEnglish -onium\n[Appendix:Glossary#learned_borrowing|Learned borrowing]] from\", \"terms\" : [ { \"id\" : \"abstract suffix\", \"children\" : [ { \"keyword_abbrev\" : \"nom.\", \"keyword_label\" : \"Nominalization of\", \"terms\" : [ { \"id\" : \"suffix forming adjectives\", \"children\" : [ { \"terms\" : [ { \"id\" : \"suffix forming adjectives\", \"children\" : [ { \"terms\" : [ { \"id\" : \"adjective suffix\", \"children\" : [ { \"terms\" : [ { \"alt\" : \"*-ijos\", \"lang_name\" : \"Proto-Italic\", \"status\" : \"inline\", \"children\" : [ { \"terms\" : [ { \"alt\" : \"*-(i)yós\", \"children\" : [ ], \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*-yós\", \"status\" : \"ok\", \"lang\" : \"ine-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang\" : \"itc-pro\" } ], \"keyword_label\" : \"From\", \"keyword\" : \"from\" } ], \"status\" : \"ok\", \"lang_name\" : \"Proto-Italic\", \"term\" : \"*-ios\", \"lang\" : \"itc-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"Old Latin\", \"term\" : \"-ios\", \"lang\" : \"itc-ola\" } ], \"keyword_label\" : \"From\", \"keyword\" : \"from\" } ], \"status\" : \"ok\", \"lang_name\" : \"Latin\", \"term\" : \"-ius\", \"lang\" : \"la\" } ], \"keyword\" : \"nominalization\" } ], \"status\" : \"ok\", \"lang_name\" : \"Latin\", \"term\" : \"-ium\", \"lang\" : \"la\" } ], \"keyword\" : \"lbor\" } ], \"lang_name\" : \"English\", \"term\" : \"-ium\", \"status\" : \"ok\", \"lang\" : \"en\" } ], \"keyword_label\" : \"From\", \"is_group\" : true, \"keyword\" : \"affix\" } ], \"status\" : \"ok\", \"lang_name\" : \"English\", \"term\" : \"-onium\", \"lang\" : \"en\" }\" data-id=\"particle physics\" data-lang=\"en\" data-title=\"-onium\" id=\"English:_particle_physics\">"
    },
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    },
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    }
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      "onium#English:_from-pattern-whence-muonium_s-name"
    ],
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      "-on",
      "-on#English:_particle"
    ],
    [
      "*-(i)yós",
      "Reconstruction:Proto-Indo-European/-yós"
    ],
    [
      "*-ios",
      "Reconstruction:Proto-Italic/-ios#Proto-Italic:_adjective_suffix"
    ],
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      "-ios",
      "-ios#Latin:_suffix_forming_adjectives"
    ],
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      "-ius",
      "-ius#Latin:_suffix_forming_adjectives"
    ],
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      "-ium",
      "-ium#Latin:_abstract_suffix"
    ],
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      "onium#English:_from-pattern-whence-muonium_s-name"
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      "-on#English"
    ],
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      "-ium",
      "-ium#English"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
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        "Designating an onium particle."
      ],
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        "morpheme",
        "particle"
      ],
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Source etymology 2

Original entry ↗
suffix

Used to form the name of polyatomic cations. Common examples are quaternary ammonium compounds used as neuromuscular blocking agents, cholinergic agents, anticholinergic agents, antibacterials/antiseptics, or other agents.

Selected source glosses provide context, not a complete modern definition inventory

Etymology tree New Latin ammōniumbor. English ammonium English onium English -onium From onium.

Inspect preserved source fields

Raw extraction fields are retained for auditing. Their order does not establish ancestry.

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    {
      "name": "etymon",
      "args": {
        "1": "en",
        "2": "onium<id:der-en-en-ammonium>",
        "id": "chemistry",
        "tree": "1",
        "text": "+"
      },
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    },
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        "text": "+"
      },
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    }
  ],
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      "ammōnium",
      "ammonium#Latin"
    ],
    [
      "ammonium",
      "ammonium#English"
    ],
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      "onium",
      "onium#English:_der-en-en-ammonium"
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Where this record stops

This page does not supply an independently verified sound-change sequence, first-use manuscript or complete family tree unless a cited analysis explicitly establishes one. Missing detail here is a limit of this record—not a claim that humanity knows nothing more.

An older meaning does not determine what a word must mean today. Follow the sources, preserve disagreements, and keep ancestry separate from interpretation.

Contribute located evidence for -onium →

Source and snapshot

Imported from Wiktionary contributors; extracted by Tatu Ylonen / Wiktextract / Kaikki.org. Selected fields are reformatted and grouped; wording, source identity and etymology sections are retained. CC-BY-SA-4.0 applies to the imported source material.

Dump: 2026-10-01 · Extracted: 2026-10-30. These are snapshot dates, not the word’s first attestation or the page’s revision date.

Source entry and bibliography ↗Wiktionary revision history ↗Acquisition and rights ledger
Machine-source provenance
Source SHA-256
5ff2c072f8099f2d2ce484bd6957bf179f046d2ad37bc36555edf8bb84cb5291
Import run
73216b9a9b78ed3830994bf853103716f5a4dc57099e371e9f8fdc468facca26
Permanent entry ID
w-LW9uaXVt