"couplant" meaning in English

{
  "forms": [
    {
      "form": "couplants",
      "tags": [
        "plural"
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      "expansion": "couplant (plural couplants)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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      "examples": [
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          "bold_text_offsets": [
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              41,
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          "ref": "1996, Sandra M. Faber, The design and assembly of camera lens cells for fluid couplants using elastomeric lens mounts:",
          "text": "The primary design challenge using fluid couplants is providing proper sealing so that the fluid does not leak out over time. One approach is to pot the lenses into their cells.",
          "type": "quote"
        },
        {
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              64
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            [
              159,
              167
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          ],
          "ref": "2001, Chuck Hellier, Handbook of Nondestructive Evaluation, pages 7–13:",
          "text": "There are many suitable substances that can be used as couplants, the main criteria being the best possible match and no adverse chemical reaction between the couplant and the metal.",
          "type": "quote"
        }
      ],
      "glosses": [
        "a material that facilitates the transmission of ultrasonic energy from the transducer into the test specimen."
      ],
      "id": "en-couplant-en-noun-0gwn3wca"
    }
  ],
  "word": "couplant"
}

{
  "forms": [
    {
      "form": "couplants",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "couplant (plural couplants)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        "English countable nouns",
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      "examples": [
        {
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            [
              41,
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          ],
          "ref": "1996, Sandra M. Faber, The design and assembly of camera lens cells for fluid couplants using elastomeric lens mounts:",
          "text": "The primary design challenge using fluid couplants is providing proper sealing so that the fluid does not leak out over time. One approach is to pot the lenses into their cells.",
          "type": "quote"
        },
        {
          "bold_text_offsets": [
            [
              55,
              63
            ],
            [
              55,
              64
            ],
            [
              159,
              167
            ]
          ],
          "ref": "2001, Chuck Hellier, Handbook of Nondestructive Evaluation, pages 7–13:",
          "text": "There are many suitable substances that can be used as couplants, the main criteria being the best possible match and no adverse chemical reaction between the couplant and the metal.",
          "type": "quote"
        }
      ],
      "glosses": [
        "a material that facilitates the transmission of ultrasonic energy from the transducer into the test specimen."
      ]
    }
  ],
  "word": "couplant"
}