"rarefactive" meaning in English

{
  "forms": [
    {
      "form": "more rarefactive",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most rarefactive",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "rarefactive (comparative more rarefactive, superlative most rarefactive)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Of, pertaining to, or causing rarefaction"
      ],
      "id": "en-rarefactive-en-adj-qXSTPm-V",
      "links": [
        [
          "rarefaction",
          "rarefaction"
        ]
      ]
    }
  ],
  "word": "rarefactive"
}

{
  "forms": [
    {
      "form": "more rarefactive",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most rarefactive",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "rarefactive (comparative more rarefactive, superlative most rarefactive)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Of, pertaining to, or causing rarefaction"
      ],
      "links": [
        [
          "rarefaction",
          "rarefaction"
        ]
      ]
    }
  ],
  "word": "rarefactive"
}