"релси" meaning in Bulgare

{
  "categories": [
    {
      "kind": "other",
      "name": "Formes de noms communs en bulgare",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Bulgare",
      "orig": "bulgare",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Bulgare",
  "lang_code": "bg",
  "pos": "noun",
  "pos_title": "Forme de nom commun",
  "senses": [
    {
      "form_of": [
        {
          "word": "релса"
        }
      ],
      "glosses": [
        "Pluriel de релса."
      ],
      "id": "fr-релси-bg-noun-I2MZA3rD"
    }
  ],
  "tags": [
    "feminine",
    "form-of"
  ],
  "word": "релси"
}

{
  "categories": [
    "Formes de noms communs en bulgare",
    "bulgare"
  ],
  "lang": "Bulgare",
  "lang_code": "bg",
  "pos": "noun",
  "pos_title": "Forme de nom commun",
  "senses": [
    {
      "form_of": [
        {
          "word": "релса"
        }
      ],
      "glosses": [
        "Pluriel de релса."
      ]
    }
  ],
  "tags": [
    "feminine",
    "form-of"
  ],
  "word": "релси"
}