"prehistorias" meaning in Español

{
  "categories": [
    {
      "kind": "other",
      "name": "ES:Palabras llanas",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "ES:Palabras trisílabas",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "ES:Rimas:o.ɾjas",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Español",
      "parents": [],
      "source": "w"
    }
  ],
  "extra_sounds": {
    "acentuación": "llana",
    "longitud silábica": "trisílaba"
  },
  "hyphenation": "prehis-to-rias",
  "lang": "Español",
  "lang_code": "es",
  "pos": "noun",
  "pos_title": "forma sustantiva femenina",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "ES:Formas sustantivas en plural",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "prehistoria"
        }
      ],
      "glosses": [
        "Forma del plural de prehistoria."
      ],
      "id": "es-prehistorias-es-noun-0qOMbnaD",
      "sense_index": "1"
    }
  ],
  "sounds": [
    {
      "ipa": "[pɾei̯sˈt̪o.ɾjas]"
    },
    {
      "rhymes": "o.ɾjas"
    }
  ],
  "tags": [
    "feminine",
    "form-of"
  ],
  "word": "prehistorias"
}

{
  "categories": [
    "ES:Palabras llanas",
    "ES:Palabras trisílabas",
    "ES:Rimas:o.ɾjas",
    "Español"
  ],
  "extra_sounds": {
    "acentuación": "llana",
    "longitud silábica": "trisílaba"
  },
  "hyphenation": "prehis-to-rias",
  "lang": "Español",
  "lang_code": "es",
  "pos": "noun",
  "pos_title": "forma sustantiva femenina",
  "senses": [
    {
      "categories": [
        "ES:Formas sustantivas en plural"
      ],
      "form_of": [
        {
          "word": "prehistoria"
        }
      ],
      "glosses": [
        "Forma del plural de prehistoria."
      ],
      "sense_index": "1"
    }
  ],
  "sounds": [
    {
      "ipa": "[pɾei̯sˈt̪o.ɾjas]"
    },
    {
      "rhymes": "o.ɾjas"
    }
  ],
  "tags": [
    "feminine",
    "form-of"
  ],
  "word": "prehistorias"
}