*SET-U

English word origin

Etymology of louse

Etymology tree Proto-Indo-European *lewH-? Proto-Germanic *lūs Proto-West Germanic *lūs Old English lūs Middle English lous English louse From Middle English lous, lows, lowse, from Old English lūs, from Proto-West Germa

1 source sectionExtended source reportWiktionary original ↗
In this entry · 1 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 ↗
verb

To remove lice from; to delouse.

noun

A small parasitic wingless insect of the order Psocodea. · A contemptible person; one who is deceitful or causes harm. · The currency sign ¤.

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

Etymology tree Proto-Indo-European *lewH-? Proto-Germanic *lūs Proto-West Germanic *lūs Old English lūs Middle English lous English louse From Middle English lous, lows, lowse, from Old English lūs, from Proto-West Germanic *lūs, from Proto-Germanic *lūs, from Proto-Indo-European *lewH-. Cognate with West Frisian lûs, Dutch luis, German Low German Luus, German Laus, Danish, Norwegian Bokmål, Norwegian Nynorsk, and Swedish lus, Faroese and Icelandic lús; also Welsh llau (“lice”), Tocharian B luwo, maybe Sanskrit यूका (yūkā).

Relationships mentioned by the source

These are extracted mentions, not a timeline or a verified sequence of immediate parents.

  • Inherited-form mentionlousenm
  • Inherited-form mentionlūsang
  • Inherited-form mention*lūsgmw-pro
  • Inherited-form mention*lūsgem-pro
  • Derivation mention*lewH-ine-pro
  • Cognate mentionlûsfy
  • Cognate mentionluisnl
  • Cognate mentionLausde
  • Cognate mentionllaucy · lice
  • Cognate mentionluwotxb
Inspect preserved source fields

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

{
  "templates": [
    {
      "name": "ety",
      "args": {
        "1": "en",
        "2": ":inh",
        "3": "enm:lous",
        "id": "insect",
        "tree": "1"
      },
      "expansion": "Etymology tree\nProto-Indo-European *lewH-?\nProto-Germanic *lūs\nProto-West Germanic *lūs\nOld English lūs\nMiddle English lous\nEnglish louse\n[Appendix:Glossary#inherited|Inherited]] from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Proto-Germanic\", \"term\" : \"*lūs\", \"status\" : \"ok\", \"lang\" : \"gem-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Proto-West Germanic\", \"term\" : \"*lūs\", \"status\" : \"ok\", \"lang\" : \"gmw-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Old English\", \"term\" : \"lūs\", \"status\" : \"ok\", \"lang\" : \"ang\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Middle English\", \"term\" : \"lous\", \"status\" : \"ok\", \"lang\" : \"enm\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"English\", \"term\" : \"louse\", \"lang\" : \"en\" }\" data-id=\"insect\" data-lang=\"en\" data-title=\"louse\" id=\"English:_insect\">"
    },
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "enm",
        "3": "lous"
      },
      "expansion": "Middle English lous"
    },
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "ang",
        "3": "lūs"
      },
      "expansion": "Old English lūs"
    },
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "gmw-pro",
        "3": "*lūs"
      },
      "expansion": "Proto-West Germanic *lūs"
    },
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "gem-pro",
        "3": "*lūs"
      },
      "expansion": "Proto-Germanic *lūs"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "ine-pro",
        "3": "*lewH-"
      },
      "expansion": "Proto-Indo-European *lewH-"
    },
    {
      "name": "cog",
      "args": {
        "1": "fy",
        "2": "lûs"
      },
      "expansion": "West Frisian lûs"
    },
    {
      "name": "cog",
      "args": {
        "1": "nl",
        "2": "luis"
      },
      "expansion": "Dutch luis"
    },
    {
      "name": "cog",
      "args": {
        "1": "nds-de",
        "2": "Luus"
      },
      "expansion": "German Low German Luus"
    },
    {
      "name": "cog",
      "args": {
        "1": "de",
        "2": "Laus"
      },
      "expansion": "German Laus"
    },
    {
      "name": "cog",
      "args": {
        "1": "da,nb,nn,sv",
        "2": "lus"
      },
      "expansion": "Danish, Norwegian Bokmål, Norwegian Nynorsk, and Swedish lus"
    },
    {
      "name": "cog",
      "args": {
        "1": "fo,is",
        "2": "lús"
      },
      "expansion": "Faroese and Icelandic lús"
    },
    {
      "name": "cog",
      "args": {
        "1": "cy",
        "2": "llau",
        "t": "lice"
      },
      "expansion": "Welsh llau (“lice”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "txb",
        "2": "luwo"
      },
      "expansion": "Tocharian B luwo"
    },
    {
      "name": "noncog",
      "args": {
        "1": "sa",
        "2": "यूका"
      },
      "expansion": "Sanskrit यूका (yūkā)"
    },
    {
      "name": "ety",
      "args": {
        "1": "en",
        "2": ":inh",
        "3": "enm:lous",
        "id": "insect",
        "tree": "1"
      },
      "expansion": "Etymology tree\nProto-Indo-European *lewH-?\nProto-Germanic *lūs\nProto-West Germanic *lūs\nOld English lūs\nMiddle English lous\nEnglish louse"
    }
  ],
  "links": [
    [
      "*lewH-",
      "Reconstruction:Proto-Indo-European/lewH-"
    ],
    [
      "*lūs",
      "Reconstruction:Proto-Germanic/lūs"
    ],
    [
      "*lūs",
      "Reconstruction:Proto-West Germanic/lūs"
    ],
    [
      "lūs",
      "lus#Old_English"
    ],
    [
      "lous",
      "lous#Middle_English"
    ],
    [
      "lous",
      "lous#Middle_English"
    ],
    [
      "lows",
      "lows#Middle_English"
    ],
    [
      "lowse",
      "lowse#Middle_English"
    ],
    [
      "lūs",
      "lus#Old_English"
    ],
    [
      "*lūs",
      "Reconstruction:Proto-West Germanic/lūs"
    ],
    [
      "*lūs",
      "Reconstruction:Proto-Germanic/lūs"
    ],
    [
      "*lewH-",
      "Reconstruction:Proto-Indo-European/lewH-"
    ],
    [
      "lûs",
      "lûs#West_Frisian"
    ],
    [
      "luis",
      "luis#Dutch"
    ],
    [
      "Luus",
      "Luus#Low_German"
    ],
    [
      "Laus",
      "Laus#German"
    ],
    [
      "Danish",
      "lus#Danish"
    ],
    [
      "Norwegian Bokmål",
      "lus#Norwegian_Bokmål"
    ],
    [
      "Norwegian Nynorsk",
      "lus#Norwegian_Nynorsk"
    ],
    [
      "lus",
      "lus#Swedish"
    ],
    [
      "Faroese",
      "lús#Faroese"
    ],
    [
      "lús",
      "lús#Icelandic"
    ],
    [
      "llau",
      "llau#Welsh"
    ],
    [
      "luwo",
      "luwo#Tocharian_B"
    ],
    [
      "यूका",
      "यूका#Sanskrit"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "verb",
      "glosses": [
        "To remove lice from; to delouse."
      ],
      "tags": [
        "transitive"
      ],
      "recordId": "ad001bcea287e759d8a7e5b251479970ebe7abcfca3225309eef55a476fe20e4",
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      "sourceRecordOrdinal": 146102
    },
    {
      "pos": "noun",
      "glosses": [
        "A small parasitic wingless insect of the order Psocodea.",
        "A contemptible person; one who is deceitful or causes harm.",
        "The currency sign ¤."
      ],
      "tags": [
        "colloquial",
        "dated",
        "slang"
      ],
      "recordId": "fe21e825c5d155ce47bad79541d34b96b0506430862edff13798967c53f2da4d",
      "rawRecordSha256": "6bc0b9dd6e6591919ee324c1ca6fd729ecb678ff45ab43ad7d74a81484376f74",
      "sourceRecordOrdinal": 146101
    }
  ],
  "omittedAuxiliaryFields": {
    "templates": 0,
    "links": 0,
    "references": 0,
    "descendants": 0,
    "lexicalRecords": 0,
    "lexicalSenses": 0,
    "glosses": 0
  }
}

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 louse →

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-bG91c2U