"two-seam fastball" meaning in English

{
  "forms": [
    {
      "form": "two-seam fastballs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "two-seam fastball (plural two-seam fastballs)",
      "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": "Baseball",
          "orig": "en:Baseball",
          "parents": [
            "Ball games",
            "Sports",
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "His two-seamer has a heavy sink and keeps the infielders busy.",
          "type": "example"
        }
      ],
      "glosses": [
        "A pitch thrown with a grip in the \"horseshoe\" orientation of the ball, with the rotation at a slight angle resulting in less Magnus effect as compared to a four-seam fastball since only two of the ball's seams cross the flight path; the pitch is delivered with a similar velocity as a four-seam fastball, but has a degree of sink."
      ],
      "id": "en-two-seam_fastball-en-noun-fPNyNmlR",
      "links": [
        [
          "baseball",
          "baseball"
        ],
        [
          "pitch",
          "pitch"
        ],
        [
          "ball",
          "ball"
        ],
        [
          "rotation",
          "rotation"
        ],
        [
          "four-seam fastball",
          "four-seam fastball"
        ]
      ],
      "raw_glosses": [
        "(baseball) A pitch thrown with a grip in the \"horseshoe\" orientation of the ball, with the rotation at a slight angle resulting in less Magnus effect as compared to a four-seam fastball since only two of the ball's seams cross the flight path; the pitch is delivered with a similar velocity as a four-seam fastball, but has a degree of sink."
      ],
      "related": [
        {
          "word": "curveball"
        },
        {
          "word": "fastball"
        },
        {
          "word": "slider"
        },
        {
          "word": "four-seam fastball"
        },
        {
          "word": "split-finger fastball"
        },
        {
          "word": "sinker"
        },
        {
          "word": "screwball"
        },
        {
          "word": "knuckleball"
        }
      ],
      "topics": [
        "ball-games",
        "baseball",
        "games",
        "hobbies",
        "lifestyle",
        "sports"
      ]
    }
  ],
  "word": "two-seam fastball"
}

{
  "forms": [
    {
      "form": "two-seam fastballs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "two-seam fastball (plural two-seam fastballs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "curveball"
    },
    {
      "word": "fastball"
    },
    {
      "word": "slider"
    },
    {
      "word": "four-seam fastball"
    },
    {
      "word": "split-finger fastball"
    },
    {
      "word": "sinker"
    },
    {
      "word": "screwball"
    },
    {
      "word": "knuckleball"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with usage examples",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Baseball"
      ],
      "examples": [
        {
          "text": "His two-seamer has a heavy sink and keeps the infielders busy.",
          "type": "example"
        }
      ],
      "glosses": [
        "A pitch thrown with a grip in the \"horseshoe\" orientation of the ball, with the rotation at a slight angle resulting in less Magnus effect as compared to a four-seam fastball since only two of the ball's seams cross the flight path; the pitch is delivered with a similar velocity as a four-seam fastball, but has a degree of sink."
      ],
      "links": [
        [
          "baseball",
          "baseball"
        ],
        [
          "pitch",
          "pitch"
        ],
        [
          "ball",
          "ball"
        ],
        [
          "rotation",
          "rotation"
        ],
        [
          "four-seam fastball",
          "four-seam fastball"
        ]
      ],
      "raw_glosses": [
        "(baseball) A pitch thrown with a grip in the \"horseshoe\" orientation of the ball, with the rotation at a slight angle resulting in less Magnus effect as compared to a four-seam fastball since only two of the ball's seams cross the flight path; the pitch is delivered with a similar velocity as a four-seam fastball, but has a degree of sink."
      ],
      "topics": [
        "ball-games",
        "baseball",
        "games",
        "hobbies",
        "lifestyle",
        "sports"
      ]
    }
  ],
  "word": "two-seam fastball"
}