"protospine" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "proto",
        "3": "spine"
      },
      "expansion": "proto- + spine",
      "name": "prefix"
    }
  ],
  "etymology_text": "From proto- + spine.",
  "forms": [
    {
      "form": "protospines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "protospine (plural protospines)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms prefixed with proto-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A structure that develops into a spine"
      ],
      "id": "en-protospine-en-noun-CtnRqrfe",
      "links": [
        [
          "spine",
          "spine"
        ]
      ]
    }
  ],
  "word": "protospine"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "proto",
        "3": "spine"
      },
      "expansion": "proto- + spine",
      "name": "prefix"
    }
  ],
  "etymology_text": "From proto- + spine.",
  "forms": [
    {
      "form": "protospines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "protospine (plural protospines)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms prefixed with proto-",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "A structure that develops into a spine"
      ],
      "links": [
        [
          "spine",
          "spine"
        ]
      ]
    }
  ],
  "word": "protospine"
}