"istreg" meaning in Breton

{
  "categories": [
    {
      "kind": "other",
      "name": "Dérivations en breton",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Mots en breton suffixés avec -eg",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en breton",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Breton",
      "orig": "breton",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Dérivé de istr, avec le suffixe -eg.",
    "Mentionné dans le dictionnaire français-breton de Grégoire de Rostrenen (1732) : (h)istrecq."
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "glosses": [
        "Huîtrière, parc à huîtres."
      ],
      "id": "fr-istreg-br-noun-7aECnx~G"
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈistrek\\"
    }
  ],
  "tags": [
    "feminine",
    "plural"
  ],
  "word": "istreg"
}

{
  "categories": [
    "Dérivations en breton",
    "Mots en breton suffixés avec -eg",
    "Noms communs en breton",
    "breton"
  ],
  "etymology_texts": [
    "Dérivé de istr, avec le suffixe -eg.",
    "Mentionné dans le dictionnaire français-breton de Grégoire de Rostrenen (1732) : (h)istrecq."
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "glosses": [
        "Huîtrière, parc à huîtres."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈistrek\\"
    }
  ],
  "tags": [
    "feminine",
    "plural"
  ],
  "word": "istreg"
}