"onco-" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "ine-pro",
        "3": "*h₂enk-"
      },
      "expansion": "",
      "name": "root"
    },
    {
      "args": {
        "1": "en",
        "2": "NL.",
        "3": "onco-",
        "4": "",
        "5": "tumor"
      },
      "expansion": "New Latin onco- (“tumor”)",
      "name": "der"
    },
    {
      "args": {
        "1": "en",
        "2": "grc",
        "3": "ὄγκος",
        "4": "",
        "5": "lump, mass, bulk"
      },
      "expansion": "Ancient Greek ὄγκος (ónkos, “lump, mass, bulk”)",
      "name": "der"
    }
  ],
  "etymology_text": "First attested 1857, from New Latin onco- (“tumor”). from Ancient Greek ὄγκος (ónkos, “lump, mass, bulk”).",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prefix",
        "head": "",
        "sort": ""
      },
      "expansion": "onco-",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "onco-",
      "name": "en-prefix"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "oncologist"
        },
        {
          "word": "oncology"
        },
        {
          "word": "oncomouse"
        },
        {
          "word": "onconeural"
        },
        {
          "word": "oncovaccine"
        }
      ],
      "glosses": [
        "Pertaining to tumors."
      ],
      "id": "en-onco--en-prefix-r7I6BEEW",
      "links": [
        [
          "tumor",
          "tumor"
        ]
      ],
      "tags": [
        "morpheme"
      ],
      "translations": [
        {
          "code": "ca",
          "lang": "Catalan",
          "sense": "pertaining to tumors",
          "word": "onco-"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "pertaining to tumors",
          "word": "onko-"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "onko-",
          "sense": "pertaining to tumors",
          "word": "онко-"
        }
      ]
    }
  ],
  "word": "onco-"
}

{
  "derived": [
    {
      "word": "oncologist"
    },
    {
      "word": "oncology"
    },
    {
      "word": "oncomouse"
    },
    {
      "word": "onconeural"
    },
    {
      "word": "oncovaccine"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "ine-pro",
        "3": "*h₂enk-"
      },
      "expansion": "",
      "name": "root"
    },
    {
      "args": {
        "1": "en",
        "2": "NL.",
        "3": "onco-",
        "4": "",
        "5": "tumor"
      },
      "expansion": "New Latin onco- (“tumor”)",
      "name": "der"
    },
    {
      "args": {
        "1": "en",
        "2": "grc",
        "3": "ὄγκος",
        "4": "",
        "5": "lump, mass, bulk"
      },
      "expansion": "Ancient Greek ὄγκος (ónkos, “lump, mass, bulk”)",
      "name": "der"
    }
  ],
  "etymology_text": "First attested 1857, from New Latin onco- (“tumor”). from Ancient Greek ὄγκος (ónkos, “lump, mass, bulk”).",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prefix",
        "head": "",
        "sort": ""
      },
      "expansion": "onco-",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "onco-",
      "name": "en-prefix"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English prefixes",
        "English terms derived from Ancient Greek",
        "English terms derived from New Latin",
        "English terms derived from Proto-Indo-European",
        "English terms derived from the Proto-Indo-European root *h₂enk-"
      ],
      "glosses": [
        "Pertaining to tumors."
      ],
      "links": [
        [
          "tumor",
          "tumor"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "translations": [
    {
      "code": "ca",
      "lang": "Catalan",
      "sense": "pertaining to tumors",
      "word": "onco-"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "pertaining to tumors",
      "word": "onko-"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "onko-",
      "sense": "pertaining to tumors",
      "word": "онко-"
    }
  ],
  "word": "onco-"
}