"defoamer" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "defoam",
        "3": "er",
        "id2": "agent noun"
      },
      "expansion": "defoam + -er",
      "name": "suffix"
    }
  ],
  "etymology_text": "defoam + -er",
  "forms": [
    {
      "form": "defoamers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "defoamer (plural defoamers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "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 suffixed with -er (agent noun)",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2007, Theo Mang, Wilfried Dresel, Lubricants and Lubrication, page 106",
          "text": "Nowadays silicone-free defoamers are used moreand more in many applications.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Any chemical agent used for defoaming."
      ],
      "id": "en-defoamer-en-noun-~Y4xCLEy",
      "links": [
        [
          "chemical",
          "chemical"
        ],
        [
          "agent",
          "agent"
        ],
        [
          "defoam",
          "defoam"
        ]
      ]
    }
  ],
  "word": "defoamer"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "defoam",
        "3": "er",
        "id2": "agent noun"
      },
      "expansion": "defoam + -er",
      "name": "suffix"
    }
  ],
  "etymology_text": "defoam + -er",
  "forms": [
    {
      "form": "defoamers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "defoamer (plural defoamers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms suffixed with -er (agent noun)",
        "English terms with quotations",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "2007, Theo Mang, Wilfried Dresel, Lubricants and Lubrication, page 106",
          "text": "Nowadays silicone-free defoamers are used moreand more in many applications.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Any chemical agent used for defoaming."
      ],
      "links": [
        [
          "chemical",
          "chemical"
        ],
        [
          "agent",
          "agent"
        ],
        [
          "defoam",
          "defoam"
        ]
      ]
    }
  ],
  "word": "defoamer"
}