"duotones" meaning in Engels

{
  "categories": [
    {
      "kind": "other",
      "name": "Woorden in het Engels",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Woorden in het Engels met audioweergave",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Woorden in het Engels van lengte 8",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Woorden in het Nederlands met IPA-weergave",
      "parents": [],
      "source": "w"
    }
  ],
  "hyphenation": "duo·tones",
  "lang": "Engels",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Zelfstandig naamwoord",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Zelfstandignaamwoordsvorm in het Nederlands",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "duotone"
        }
      ],
      "glosses": [
        "meervoud van het zelfstandig naamwoord duotone"
      ],
      "id": "nl-duotones-en-noun-6ivO0Hsb",
      "tags": [
        "form-of",
        "plural"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-us-duotones.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/8/8a/En-us-duotones.ogg/En-us-duotones.ogg.mp3",
      "ogg_url": "https://commons.wikimedia.org/wiki/Special:FilePath/en-us-duotones.ogg"
    },
    {
      "ipa": "/ˈd(y)üəˌtons/"
    }
  ],
  "word": "duotones"
}

{
  "categories": [
    "Woorden in het Engels",
    "Woorden in het Engels met audioweergave",
    "Woorden in het Engels van lengte 8",
    "Woorden in het Nederlands met IPA-weergave"
  ],
  "hyphenation": "duo·tones",
  "lang": "Engels",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Zelfstandig naamwoord",
  "senses": [
    {
      "categories": [
        "Zelfstandignaamwoordsvorm in het Nederlands"
      ],
      "form_of": [
        {
          "word": "duotone"
        }
      ],
      "glosses": [
        "meervoud van het zelfstandig naamwoord duotone"
      ],
      "tags": [
        "form-of",
        "plural"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-us-duotones.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/8/8a/En-us-duotones.ogg/En-us-duotones.ogg.mp3",
      "ogg_url": "https://commons.wikimedia.org/wiki/Special:FilePath/en-us-duotones.ogg"
    },
    {
      "ipa": "/ˈd(y)üəˌtons/"
    }
  ],
  "word": "duotones"
}