"plethysmometer" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "grc",
        "3": "πληθυσμός",
        "t": "increase"
      },
      "expansion": "Ancient Greek πληθυσμός (plēthusmós, “increase”)",
      "name": "bor"
    },
    {
      "args": {
        "1": "en",
        "2": "-meter"
      },
      "expansion": "-meter",
      "name": "affix"
    }
  ],
  "etymology_text": "Ancient Greek πληθυσμός (plēthusmós, “increase”) + -meter.",
  "forms": [
    {
      "form": "plethysmometers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "plethysmometer (plural plethysmometers)",
      "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 -meter",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Any instrument designed to measure small changes in volume, usually via the displacement of water"
      ],
      "id": "en-plethysmometer-en-noun-sO-HJyRF",
      "links": [
        [
          "instrument",
          "instrument"
        ],
        [
          "volume",
          "volume"
        ],
        [
          "displacement",
          "displacement"
        ],
        [
          "water",
          "water"
        ]
      ],
      "related": [
        {
          "word": "plethysmometry"
        }
      ]
    }
  ],
  "word": "plethysmometer"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "grc",
        "3": "πληθυσμός",
        "t": "increase"
      },
      "expansion": "Ancient Greek πληθυσμός (plēthusmós, “increase”)",
      "name": "bor"
    },
    {
      "args": {
        "1": "en",
        "2": "-meter"
      },
      "expansion": "-meter",
      "name": "affix"
    }
  ],
  "etymology_text": "Ancient Greek πληθυσμός (plēthusmós, “increase”) + -meter.",
  "forms": [
    {
      "form": "plethysmometers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "plethysmometer (plural plethysmometers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "plethysmometry"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms borrowed from Ancient Greek",
        "English terms derived from Ancient Greek",
        "English terms suffixed with -meter"
      ],
      "glosses": [
        "Any instrument designed to measure small changes in volume, usually via the displacement of water"
      ],
      "links": [
        [
          "instrument",
          "instrument"
        ],
        [
          "volume",
          "volume"
        ],
        [
          "displacement",
          "displacement"
        ],
        [
          "water",
          "water"
        ]
      ]
    }
  ],
  "word": "plethysmometer"
}