"Abney level" meaning in English

{
  "etymology_text": "From the surname of English scientist William de Wiveleslie Abney.",
  "forms": [
    {
      "form": "Abney levels",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "Abney level"
      },
      "expansion": "Abney level (plural Abney levels)",
      "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": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Portuguese translations",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A clinometer used to measure tree heights."
      ],
      "id": "en-Abney_level-en-noun-uDGsrJR0",
      "links": [
        [
          "clinometer",
          "clinometer"
        ],
        [
          "The Shorter Oxford English Dictionary on Historical Principles",
          "w:Shorter Oxford English Dictionary"
        ],
        [
          "Oxford University Press",
          "w:Oxford University Press"
        ]
      ],
      "translations": [
        {
          "code": "pt",
          "lang": "Portuguese",
          "sense": "clinometer used to measure tree heights",
          "tags": [
            "masculine"
          ],
          "word": "nível de Abney"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈæb.ni ˈlɜv.l̩/",
      "tags": [
        "US"
      ]
    }
  ],
  "word": "Abney level"
}

{
  "etymology_text": "From the surname of English scientist William de Wiveleslie Abney.",
  "forms": [
    {
      "form": "Abney levels",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "Abney level"
      },
      "expansion": "Abney level (plural Abney levels)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Portuguese translations"
      ],
      "glosses": [
        "A clinometer used to measure tree heights."
      ],
      "links": [
        [
          "clinometer",
          "clinometer"
        ],
        [
          "The Shorter Oxford English Dictionary on Historical Principles",
          "w:Shorter Oxford English Dictionary"
        ],
        [
          "Oxford University Press",
          "w:Oxford University Press"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈæb.ni ˈlɜv.l̩/",
      "tags": [
        "US"
      ]
    }
  ],
  "translations": [
    {
      "code": "pt",
      "lang": "Portuguese",
      "sense": "clinometer used to measure tree heights",
      "tags": [
        "masculine"
      ],
      "word": "nível de Abney"
    }
  ],
  "word": "Abney level"
}