"ultrafine" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "ultra",
        "3": "fine"
      },
      "expansion": "ultra- + fine",
      "name": "prefix"
    }
  ],
  "etymology_text": "From ultra- + fine.",
  "forms": [
    {
      "form": "more ultrafine",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most ultrafine",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "ultrafine (comparative more ultrafine, superlative most ultrafine)",
      "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": "English terms prefixed with ultra-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "ultrafine particle"
        }
      ],
      "glosses": [
        "Very fine"
      ],
      "id": "en-ultrafine-en-adj-rBC9SApQ",
      "links": [
        [
          "fine",
          "fine"
        ]
      ],
      "raw_glosses": [
        "(of particles) Very fine"
      ],
      "raw_tags": [
        "of particles"
      ]
    }
  ],
  "word": "ultrafine"
}

{
  "derived": [
    {
      "word": "ultrafine particle"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "ultra",
        "3": "fine"
      },
      "expansion": "ultra- + fine",
      "name": "prefix"
    }
  ],
  "etymology_text": "From ultra- + fine.",
  "forms": [
    {
      "form": "more ultrafine",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most ultrafine",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "ultrafine (comparative more ultrafine, superlative most ultrafine)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English terms prefixed with ultra-",
        "Pages with 2 entries",
        "Pages with entries"
      ],
      "glosses": [
        "Very fine"
      ],
      "links": [
        [
          "fine",
          "fine"
        ]
      ],
      "raw_glosses": [
        "(of particles) Very fine"
      ],
      "raw_tags": [
        "of particles"
      ]
    }
  ],
  "word": "ultrafine"
}