"livro de texto" meaning in Portuguese

{
  "forms": [
    {
      "form": "livros de texto",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "livro de texto m (plural livros de texto)",
      "name": "pt-noun"
    }
  ],
  "lang": "Portuguese",
  "lang_code": "pt",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Portuguese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "pt",
          "name": "Books",
          "orig": "pt:Books",
          "parents": [
            "Literature",
            "Mass media",
            "Culture",
            "Entertainment",
            "Writing",
            "Media",
            "Society",
            "Human behaviour",
            "Language",
            "Communication",
            "All topics",
            "Human",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "textbook (formal manual of instruction)"
      ],
      "id": "en-livro_de_texto-pt-noun-W0xmNh~E",
      "links": [
        [
          "textbook",
          "textbook"
        ]
      ],
      "synonyms": [
        {
          "word": "compêndio"
        },
        {
          "tags": [
            "Portugal"
          ],
          "word": "sebenta"
        },
        {
          "word": "apostila"
        },
        {
          "word": "livro didático"
        }
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "livro de texto"
}

{
  "forms": [
    {
      "form": "livros de texto",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "livro de texto m (plural livros de texto)",
      "name": "pt-noun"
    }
  ],
  "lang": "Portuguese",
  "lang_code": "pt",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Portuguese countable nouns",
        "Portuguese entries with incorrect language header",
        "Portuguese lemmas",
        "Portuguese masculine nouns",
        "Portuguese multiword terms",
        "Portuguese nouns",
        "pt:Books"
      ],
      "glosses": [
        "textbook (formal manual of instruction)"
      ],
      "links": [
        [
          "textbook",
          "textbook"
        ]
      ],
      "synonyms": [
        {
          "word": "compêndio"
        },
        {
          "tags": [
            "Portugal"
          ],
          "word": "sebenta"
        },
        {
          "word": "apostila"
        },
        {
          "word": "livro didático"
        }
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "livro de texto"
}