"hoppus foot" meaning in English

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  "etymology_text": "Named after Edward Hoppus, an 18th-century English surveyor.",
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      "form": "hoppus feet",
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        "plural"
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  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "A unit of measurement for the volume of timber in the round, with a value equal to 1.27 cubic feet, where the cross-sectional area is taken as the square of one quarter of the circumference of the round."
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          "volume",
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          "square",
          "square"
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        [
          "circumference",
          "circumference"
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        "hoppus foot"
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        "A unit of measurement for the volume of timber in the round, with a value equal to 1.27 cubic feet, where the cross-sectional area is taken as the square of one quarter of the circumference of the round."
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        ],
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          "volume",
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          "square",
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          "circumference",
          "circumference"
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