"surface clutter" meaning in English

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      "expansion": "surface clutter (uncountable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "examples": [
        {
          "text": "Coordinate term: volume clutter"
        },
        {
          "ref": "2004, Rajeev Bansal, Handbook of Engineering Electromagnetics, →ISBN, page 405:",
          "text": "Unwanted echoes usually occur as distributed clutter, as surface clutter (such as land and sea echoes) or as volume clutter (such as rain, chaff).",
          "type": "quote"
        }
      ],
      "glosses": [
        "Unwanted radar or sonar wave reflection arising from the land or sea surface."
      ],
      "id": "en-surface_clutter-en-noun-fDbQtOZo",
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        [
          "radar",
          "radar"
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          "sonar",
          "sonar"
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      "raw_glosses": [
        "(engineering) Unwanted radar or sonar wave reflection arising from the land or sea surface."
      ],
      "tags": [
        "uncountable"
      ],
      "topics": [
        "engineering",
        "natural-sciences",
        "physical-sciences"
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      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "unwanted reflection",
          "word": "maavälke"
        }
      ]
    }
  ],
  "word": "surface clutter"
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  "lang_code": "en",
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          "text": "Coordinate term: volume clutter"
        },
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          "ref": "2004, Rajeev Bansal, Handbook of Engineering Electromagnetics, →ISBN, page 405:",
          "text": "Unwanted echoes usually occur as distributed clutter, as surface clutter (such as land and sea echoes) or as volume clutter (such as rain, chaff).",
          "type": "quote"
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      "glosses": [
        "Unwanted radar or sonar wave reflection arising from the land or sea surface."
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        "(engineering) Unwanted radar or sonar wave reflection arising from the land or sea surface."
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  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "unwanted reflection",
      "word": "maavälke"
    }
  ],
  "word": "surface clutter"
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