"nightglow" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "night",
        "3": "glow"
      },
      "expansion": "night + glow",
      "name": "compound"
    }
  ],
  "etymology_text": "From night + glow.",
  "forms": [
    {
      "form": "nightglows",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-",
        "2": "s"
      },
      "expansion": "nightglow (usually uncountable, plural nightglows)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English endocentric compounds",
          "parents": [
            "Endocentric compounds",
            "Compound terms",
            "Terms by etymology"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "An airglow at night."
      ],
      "id": "en-nightglow-en-noun-vtTk4NGR",
      "links": [
        [
          "airglow",
          "airglow"
        ],
        [
          "night",
          "night"
        ]
      ],
      "related": [
        {
          "word": "dayglow"
        }
      ],
      "tags": [
        "uncountable",
        "usually"
      ]
    }
  ],
  "word": "nightglow"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "night",
        "3": "glow"
      },
      "expansion": "night + glow",
      "name": "compound"
    }
  ],
  "etymology_text": "From night + glow.",
  "forms": [
    {
      "form": "nightglows",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-",
        "2": "s"
      },
      "expansion": "nightglow (usually uncountable, plural nightglows)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "dayglow"
    }
  ],
  "senses": [
    {
      "categories": [
        "English 2-syllable words",
        "English compound terms",
        "English countable nouns",
        "English endocentric compounds",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "An airglow at night."
      ],
      "links": [
        [
          "airglow",
          "airglow"
        ],
        [
          "night",
          "night"
        ]
      ],
      "tags": [
        "uncountable",
        "usually"
      ]
    }
  ],
  "word": "nightglow"
}