"short vowel" meaning in English

{
  "forms": [
    {
      "form": "short vowels",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "short vowel (plural short vowels)",
      "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": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Phonetics",
          "orig": "en:Phonetics",
          "parents": [
            "Linguistics",
            "Language",
            "Social sciences",
            "Communication",
            "Sciences",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "In languages that distinguish vowel length, a vowel which is normally pronounced shorter than a long vowel."
      ],
      "id": "en-short_vowel-en-noun-8IIVRJ-P",
      "links": [
        [
          "vowel",
          "vowel"
        ],
        [
          "length",
          "length"
        ],
        [
          "long vowel",
          "long vowel"
        ]
      ],
      "related": [
        {
          "word": "long vowel"
        },
        {
          "word": "half-long vowel"
        },
        {
          "word": "overlong vowel"
        }
      ]
    }
  ],
  "word": "short vowel"
}

{
  "forms": [
    {
      "form": "short vowels",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "short vowel (plural short vowels)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "long vowel"
    },
    {
      "word": "half-long vowel"
    },
    {
      "word": "overlong vowel"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Phonetics"
      ],
      "glosses": [
        "In languages that distinguish vowel length, a vowel which is normally pronounced shorter than a long vowel."
      ],
      "links": [
        [
          "vowel",
          "vowel"
        ],
        [
          "length",
          "length"
        ],
        [
          "long vowel",
          "long vowel"
        ]
      ]
    }
  ],
  "word": "short vowel"
}