"substack" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "sub",
        "3": "stack"
      },
      "expansion": "sub- + stack",
      "name": "prefix"
    }
  ],
  "etymology_text": "From sub- + stack.",
  "forms": [
    {
      "form": "substacks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "substack (plural substacks)",
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  "lang_code": "en",
  "pos": "noun",
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      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
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          "source": "w"
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          "name": "Mathematics",
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            "Fundamental"
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      "examples": [
        {
          "ref": "2016, Roberto Fringuelli, “The Picard group of the universal moduli space of vector bundles over ̄ℳ_g”, in arXiv:",
          "text": "In particular, we give necessary and sufficient conditions for the existence of Poincar\\'e bundles over the universal curve of an open substack of the rigidification, generalizing a result of Mestrano-Ramanan..",
          "type": "quote"
        }
      ],
      "glosses": [
        "A subset of a stack"
      ],
      "id": "en-substack-en-noun-uMM3pW71",
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "subset",
          "subset"
        ],
        [
          "stack",
          "stack"
        ]
      ],
      "raw_glosses": [
        "(mathematics) A subset of a stack"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "substack"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "sub",
        "3": "stack"
      },
      "expansion": "sub- + stack",
      "name": "prefix"
    }
  ],
  "etymology_text": "From sub- + stack.",
  "forms": [
    {
      "form": "substacks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "substack (plural substacks)",
      "name": "en-noun"
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  ],
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  "lang_code": "en",
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          "ref": "2016, Roberto Fringuelli, “The Picard group of the universal moduli space of vector bundles over ̄ℳ_g”, in arXiv:",
          "text": "In particular, we give necessary and sufficient conditions for the existence of Poincar\\'e bundles over the universal curve of an open substack of the rigidification, generalizing a result of Mestrano-Ramanan..",
          "type": "quote"
        }
      ],
      "glosses": [
        "A subset of a stack"
      ],
      "links": [
        [
          "mathematics",
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        [
          "subset",
          "subset"
        ],
        [
          "stack",
          "stack"
        ]
      ],
      "raw_glosses": [
        "(mathematics) A subset of a stack"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "substack"
}