"proplastid" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "pro",
        "3": "plastid"
      },
      "expansion": "pro- + plastid",
      "name": "prefix"
    }
  ],
  "etymology_text": "From pro- + plastid.",
  "forms": [
    {
      "form": "proplastids",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "proplastid (plural proplastids)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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          "source": "w"
        },
        {
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          "name": "English terms prefixed with pro-",
          "parents": [],
          "source": "w"
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          "source": "w"
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          "kind": "topical",
          "langcode": "en",
          "name": "Cytology",
          "orig": "en:Cytology",
          "parents": [
            "Biology",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A small, colourless cell that develops into any form of plastid"
      ],
      "id": "en-proplastid-en-noun-eQ3TZ396",
      "links": [
        [
          "cytology",
          "cytology"
        ],
        [
          "cell",
          "cell"
        ],
        [
          "plastid",
          "plastid"
        ]
      ],
      "raw_glosses": [
        "(cytology) A small, colourless cell that develops into any form of plastid"
      ],
      "topics": [
        "biology",
        "cytology",
        "medicine",
        "natural-sciences",
        "sciences"
      ]
    }
  ],
  "word": "proplastid"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "pro",
        "3": "plastid"
      },
      "expansion": "pro- + plastid",
      "name": "prefix"
    }
  ],
  "etymology_text": "From pro- + plastid.",
  "forms": [
    {
      "form": "proplastids",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "proplastid (plural proplastids)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        "en:Cytology"
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      "glosses": [
        "A small, colourless cell that develops into any form of plastid"
      ],
      "links": [
        [
          "cytology",
          "cytology"
        ],
        [
          "cell",
          "cell"
        ],
        [
          "plastid",
          "plastid"
        ]
      ],
      "raw_glosses": [
        "(cytology) A small, colourless cell that develops into any form of plastid"
      ],
      "topics": [
        "biology",
        "cytology",
        "medicine",
        "natural-sciences",
        "sciences"
      ]
    }
  ],
  "word": "proplastid"
}