"siseante" meaning in Spanish

{
  "forms": [
    {
      "form": "siseantes",
      "tags": [
        "feminine",
        "masculine",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "siseante m or f (masculine and feminine plural siseantes)",
      "name": "es-adj"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2017 September 23, 23 septiembre, 2017, “Primer capítulo de ‘Origen’, de Dan Brown”, in La Nación (Costa Rica):",
          "text": "A medio camino, un ruido fuerte y siseante lo sobresaltó.",
          "type": "quote"
        }
      ],
      "glosses": [
        "hissing"
      ],
      "id": "en-siseante-es-adj-HTCRD~6q",
      "links": [
        [
          "hissing",
          "hissing"
        ]
      ],
      "tags": [
        "feminine",
        "masculine"
      ]
    }
  ],
  "word": "siseante"
}

{
  "forms": [
    {
      "form": "siseantes",
      "tags": [
        "feminine",
        "masculine",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "siseante m or f (masculine and feminine plural siseantes)",
      "name": "es-adj"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Requests for translations of Spanish quotations",
        "Spanish adjectives",
        "Spanish adjectives with red links in their headword lines",
        "Spanish entries with incorrect language header",
        "Spanish epicene adjectives",
        "Spanish lemmas",
        "Spanish terms with quotations"
      ],
      "examples": [
        {
          "ref": "2017 September 23, 23 septiembre, 2017, “Primer capítulo de ‘Origen’, de Dan Brown”, in La Nación (Costa Rica):",
          "text": "A medio camino, un ruido fuerte y siseante lo sobresaltó.",
          "type": "quote"
        }
      ],
      "glosses": [
        "hissing"
      ],
      "links": [
        [
          "hissing",
          "hissing"
        ]
      ],
      "tags": [
        "feminine",
        "masculine"
      ]
    }
  ],
  "word": "siseante"
}