"zeir" meaning in Breton

{
  "categories": [
    {
      "kind": "other",
      "name": "Formes d’adjectifs numéraux en breton",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Breton",
      "orig": "breton",
      "parents": [],
      "source": "w"
    }
  ],
  "derived": [
    {
      "word": "hon-zeir"
    },
    {
      "word": "o-zeir"
    }
  ],
  "forms": [
    {
      "form": "teir",
      "tags": [
        "unmutated"
      ]
    },
    {
      "form": "deir",
      "tags": [
        "mutation-soft"
      ]
    }
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "adj",
  "pos_title": "Forme d’adjectif numéral",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en breton",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "Fañch an Uhel, Kontadennoù ar Bobl /3, Éditions Al Liamm, 1988, page 137",
          "text": "Un û a vanke dezhi da echuiñ he zeir dousenn.",
          "translation": "Il lui manquait un œuf pour terminer ses treize douzaines."
        }
      ],
      "form_of": [
        {
          "word": "teir"
        }
      ],
      "glosses": [
        "Forme mutée de teir par spirantisation."
      ],
      "id": "fr-zeir-br-adj-YMo9Z7Hm"
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈzɛjr\\"
    }
  ],
  "tags": [
    "feminine",
    "form-of",
    "numeral"
  ],
  "word": "zeir"
}

{
  "categories": [
    "Formes d’adjectifs numéraux en breton",
    "breton"
  ],
  "derived": [
    {
      "word": "hon-zeir"
    },
    {
      "word": "o-zeir"
    }
  ],
  "forms": [
    {
      "form": "teir",
      "tags": [
        "unmutated"
      ]
    },
    {
      "form": "deir",
      "tags": [
        "mutation-soft"
      ]
    }
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "adj",
  "pos_title": "Forme d’adjectif numéral",
  "senses": [
    {
      "categories": [
        "Exemples en breton"
      ],
      "examples": [
        {
          "ref": "Fañch an Uhel, Kontadennoù ar Bobl /3, Éditions Al Liamm, 1988, page 137",
          "text": "Un û a vanke dezhi da echuiñ he zeir dousenn.",
          "translation": "Il lui manquait un œuf pour terminer ses treize douzaines."
        }
      ],
      "form_of": [
        {
          "word": "teir"
        }
      ],
      "glosses": [
        "Forme mutée de teir par spirantisation."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈzɛjr\\"
    }
  ],
  "tags": [
    "feminine",
    "form-of",
    "numeral"
  ],
  "word": "zeir"
}