"muscle head" meaning in English

{
  "forms": [
    {
      "form": "muscle heads",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "muscle head (plural muscle heads)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "muscle-man",
          "word": "musclehead"
        }
      ],
      "glosses": [
        "Alternative spelling of musclehead (“muscle-man”)"
      ],
      "id": "en-muscle_head-en-noun-KfmL4XnK",
      "links": [
        [
          "musclehead",
          "musclehead#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    },
    {
      "categories": [
        {
          "_dis": "18 82",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "24 76",
          "kind": "topical",
          "langcode": "en",
          "name": "Muscles",
          "orig": "en:Muscles",
          "parents": [
            "Body parts",
            "Body",
            "Anatomy",
            "Human",
            "Biology",
            "Medicine",
            "All topics",
            "Sciences",
            "Fundamental"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A separately targetted compartment of a muscle, more usually referred to as head of a muscle or muscular head."
      ],
      "id": "en-muscle_head-en-noun-zujm0JA1",
      "links": [
        [
          "muscle",
          "muscle"
        ],
        [
          "head",
          "head"
        ],
        [
          "muscular",
          "muscular"
        ]
      ]
    }
  ],
  "word": "muscle head"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "en:Muscles"
  ],
  "forms": [
    {
      "form": "muscle heads",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "muscle head (plural muscle heads)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "muscle-man",
          "word": "musclehead"
        }
      ],
      "glosses": [
        "Alternative spelling of musclehead (“muscle-man”)"
      ],
      "links": [
        [
          "musclehead",
          "musclehead#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    },
    {
      "glosses": [
        "A separately targetted compartment of a muscle, more usually referred to as head of a muscle or muscular head."
      ],
      "links": [
        [
          "muscle",
          "muscle"
        ],
        [
          "head",
          "head"
        ],
        [
          "muscular",
          "muscular"
        ]
      ]
    }
  ],
  "word": "muscle head"
}