"de manual" meaning in Spanish

{
  "head_templates": [
    {
      "args": {
        "inv": "1"
      },
      "expansion": "de manual (invariable)",
      "name": "es-adj"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "_dis": "91 9",
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "textbook (having the typical characteristics of some class of phenomenon)"
      ],
      "id": "en-de_manual-es-adj-4iOJadD5",
      "links": [
        [
          "textbook",
          "textbook"
        ]
      ],
      "tags": [
        "invariable"
      ]
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "Argentinian Spanish",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "like a book; easy to read"
      ],
      "id": "en-de_manual-es-adj-H0p9JLiB",
      "links": [
        [
          "like a book",
          "like a book"
        ],
        [
          "read",
          "read"
        ]
      ],
      "raw_glosses": [
        "(Argentina, idiomatic) like a book; easy to read"
      ],
      "tags": [
        "Argentina",
        "idiomatic",
        "invariable"
      ]
    }
  ],
  "word": "de manual"
}

{
  "categories": [
    "Spanish adjectives",
    "Spanish entries with incorrect language header",
    "Spanish indeclinable adjectives",
    "Spanish lemmas",
    "Spanish multiword terms"
  ],
  "head_templates": [
    {
      "args": {
        "inv": "1"
      },
      "expansion": "de manual (invariable)",
      "name": "es-adj"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adj",
  "senses": [
    {
      "glosses": [
        "textbook (having the typical characteristics of some class of phenomenon)"
      ],
      "links": [
        [
          "textbook",
          "textbook"
        ]
      ],
      "tags": [
        "invariable"
      ]
    },
    {
      "categories": [
        "Argentinian Spanish",
        "Spanish idioms"
      ],
      "glosses": [
        "like a book; easy to read"
      ],
      "links": [
        [
          "like a book",
          "like a book"
        ],
        [
          "read",
          "read"
        ]
      ],
      "raw_glosses": [
        "(Argentina, idiomatic) like a book; easy to read"
      ],
      "tags": [
        "Argentina",
        "idiomatic",
        "invariable"
      ]
    }
  ],
  "word": "de manual"
}