"erithacorum" meaning in Latin

{
  "forms": [
    {
      "form": "erīthacōrum",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "la",
        "2": "noun form",
        "head": "erīthacōrum"
      },
      "expansion": "erīthacōrum",
      "name": "head"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Latin entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "erīthacus"
        }
      ],
      "glosses": [
        "genitive plural of erīthacus"
      ],
      "id": "en-erithacorum-la-noun-jgEpP0a1",
      "links": [
        [
          "erīthacus",
          "erithacus#Latin"
        ]
      ],
      "tags": [
        "form-of",
        "genitive",
        "plural"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ɛ.riː.tʰaˈkoː.rũː]",
      "tags": [
        "Classical-Latin"
      ]
    },
    {
      "ipa": "[e.ri.taˈkɔː.rum]",
      "note": "modern Italianate Ecclesiastical"
    }
  ],
  "word": "erithacorum"
}

{
  "forms": [
    {
      "form": "erīthacōrum",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "la",
        "2": "noun form",
        "head": "erīthacōrum"
      },
      "expansion": "erīthacōrum",
      "name": "head"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Latin 5-syllable words",
        "Latin entries with incorrect language header",
        "Latin non-lemma forms",
        "Latin noun forms",
        "Latin terms with IPA pronunciation",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "form_of": [
        {
          "word": "erīthacus"
        }
      ],
      "glosses": [
        "genitive plural of erīthacus"
      ],
      "links": [
        [
          "erīthacus",
          "erithacus#Latin"
        ]
      ],
      "tags": [
        "form-of",
        "genitive",
        "plural"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ɛ.riː.tʰaˈkoː.rũː]",
      "tags": [
        "Classical-Latin"
      ]
    },
    {
      "ipa": "[e.ri.taˈkɔː.rum]",
      "note": "modern Italianate Ecclesiastical"
    }
  ],
  "word": "erithacorum"
}