*SET-U

English word origin

Etymology of rex

From Latin rēx (“king”). Doublet of rajah and roy. Noun sense 2 originally referred to rabbits of the Belgian "castorrex" breed, so named because their fur was similar to that of beavers, and entered English around 1920.

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.

Unnumbered source etymology

Original entry ↗
verb

To breed (an animal) to have this kind of hair.

noun

A king, particularly in ancient Rome. · An animal which has a genetic recessive variation that causes the guard hairs to be very short or fully lacking.

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

From Latin rēx (“king”). Doublet of rajah and roy. Noun sense 2 originally referred to rabbits of the Belgian "castorrex" breed, so named because their fur was similar to that of beavers, and entered English around 1920.

Relationships mentioned by the source

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

  • Root classification mention*h₃reǵ-ine-pro
  • Borrowed-form mentionrēxla
  • Doublet mentionrajahen
  • Doublet mentionroyen
Inspect preserved source fields

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

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  "templates": [
    {
      "name": "root",
      "args": {
        "1": "en",
        "2": "ine-pro",
        "3": "*h₃reǵ-"
      },
      "expansion": ""
    },
    {
      "name": "bor",
      "args": {
        "1": "en",
        "2": "la",
        "3": "rēx",
        "4": "",
        "5": "king"
      },
      "expansion": "Latin rēx (“king”)"
    },
    {
      "name": "doublet",
      "args": {
        "1": "en",
        "2": "rajah",
        "3": "roy"
      },
      "expansion": "Doublet of rajah and roy"
    },
    {
      "name": "senseno",
      "args": {
        "1": "en",
        "2": "animal with very short guard hairs",
        "cap": "1"
      },
      "expansion": "Noun sense 2"
    }
  ],
  "links": [
    [
      "rēx",
      "rex#Latin"
    ],
    [
      "rajah",
      "rajah#English"
    ],
    [
      "roy",
      "roy#English"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "verb",
      "glosses": [
        "To breed (an animal) to have this kind of hair."
      ],
      "tags": [
        "transitive"
      ],
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      "rawRecordSha256": "434fea29cfaf9e47388b257b0af13c9603f63316b657837aa71d918a8d2cc716",
      "sourceRecordOrdinal": 161819
    },
    {
      "pos": "noun",
      "glosses": [
        "A king, particularly in ancient Rome.",
        "An animal which has a genetic recessive variation that causes the guard hairs to be very short or fully lacking."
      ],
      "tags": [],
      "recordId": "c19d30954de77e09e310596ecb8886ddc94c3e3d41c00a8074a766576be4a70b",
      "rawRecordSha256": "d0a11db6c6b4cb97e37380115d0c8fd63e3198f305ac6b6bc72d19a88dff7391",
      "sourceRecordOrdinal": 161818
    }
  ],
  "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 rex →

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-cmV4