"nuller" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": ":af",
        "3": "null",
        "4": "-er",
        "text": "+",
        "tree": "1"
      },
      "expansion": "Etymology tree\nEnglish null\nEnglish -er\nEnglish nuller\nFrom null + -er.",
      "name": "ety"
    }
  ],
  "etymology_text": "Etymology tree\nEnglish null\nEnglish -er\nEnglish nuller\nFrom null + -er.",
  "forms": [
    {
      "form": "nullers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "nuller (plural nullers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries referencing ambiguous etymons",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries referencing missing etymons",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with etymology texts",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with etymology trees",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms suffixed with -er",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages using etymon with no ID",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 4 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with etymology trees",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Astronomy",
          "orig": "en:Astronomy",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "An optical device that uses destructive interference to cancel out a strong light source, such as a star."
      ],
      "id": "en-nuller-en-noun-6OZSGkPo",
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "optical",
          "optical"
        ],
        [
          "destructive",
          "destructive"
        ],
        [
          "interference",
          "interference"
        ],
        [
          "cancel",
          "cancel"
        ],
        [
          "star",
          "star"
        ]
      ],
      "raw_glosses": [
        "(astronomy) An optical device that uses destructive interference to cancel out a strong light source, such as a star."
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ]
    }
  ],
  "word": "nuller"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": ":af",
        "3": "null",
        "4": "-er",
        "text": "+",
        "tree": "1"
      },
      "expansion": "Etymology tree\nEnglish null\nEnglish -er\nEnglish nuller\nFrom null + -er.",
      "name": "ety"
    }
  ],
  "etymology_text": "Etymology tree\nEnglish null\nEnglish -er\nEnglish nuller\nFrom null + -er.",
  "forms": [
    {
      "form": "nullers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "nuller (plural nullers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries referencing ambiguous etymons",
        "English entries referencing missing etymons",
        "English entries with etymology texts",
        "English entries with etymology trees",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms suffixed with -er",
        "Pages using etymon with no ID",
        "Pages with 4 entries",
        "Pages with entries",
        "Pages with etymology trees",
        "en:Astronomy"
      ],
      "glosses": [
        "An optical device that uses destructive interference to cancel out a strong light source, such as a star."
      ],
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "optical",
          "optical"
        ],
        [
          "destructive",
          "destructive"
        ],
        [
          "interference",
          "interference"
        ],
        [
          "cancel",
          "cancel"
        ],
        [
          "star",
          "star"
        ]
      ],
      "raw_glosses": [
        "(astronomy) An optical device that uses destructive interference to cancel out a strong light source, such as a star."
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ]
    }
  ],
  "word": "nuller"
}