"clast" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "clastic"
      },
      "expansion": "Back-formation from clastic",
      "name": "back-form"
    }
  ],
  "etymology_text": "Back-formation from clastic.",
  "forms": [
    {
      "form": "clasts",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "clast (plural clasts)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English back-formations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Geology",
          "orig": "en:Geology",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Rocks",
          "orig": "en:Rocks",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "bioclast"
        },
        {
          "word": "crystalloclast"
        },
        {
          "word": "epiclast"
        },
        {
          "word": "hyaloclastite"
        },
        {
          "word": "interclast"
        },
        {
          "word": "intraclast"
        },
        {
          "word": "porphyroclast"
        },
        {
          "word": "xenoclast"
        }
      ],
      "glosses": [
        "a fragment of rock that was broken from a larger rock or rock unit."
      ],
      "id": "en-clast-en-noun--4VzPMyz",
      "links": [
        [
          "geology",
          "geology"
        ],
        [
          "rock",
          "rock"
        ]
      ],
      "raw_glosses": [
        "(geology) a fragment of rock that was broken from a larger rock or rock unit."
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ],
      "wikipedia": [
        "clast"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/klæst/"
    },
    {
      "audio": "LL-Q1860 (eng)-Vealhurl-clast.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/9/92/LL-Q1860_%28eng%29-Vealhurl-clast.wav/LL-Q1860_%28eng%29-Vealhurl-clast.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/9/92/LL-Q1860_%28eng%29-Vealhurl-clast.wav/LL-Q1860_%28eng%29-Vealhurl-clast.wav.ogg"
    },
    {
      "rhymes": "-æst"
    }
  ],
  "word": "clast"
}

{
  "derived": [
    {
      "word": "bioclast"
    },
    {
      "word": "crystalloclast"
    },
    {
      "word": "epiclast"
    },
    {
      "word": "hyaloclastite"
    },
    {
      "word": "interclast"
    },
    {
      "word": "intraclast"
    },
    {
      "word": "porphyroclast"
    },
    {
      "word": "xenoclast"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "clastic"
      },
      "expansion": "Back-formation from clastic",
      "name": "back-form"
    }
  ],
  "etymology_text": "Back-formation from clastic.",
  "forms": [
    {
      "form": "clasts",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "clast (plural clasts)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English back-formations",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "Rhymes:English/æst",
        "Rhymes:English/æst/1 syllable",
        "en:Geology",
        "en:Rocks"
      ],
      "glosses": [
        "a fragment of rock that was broken from a larger rock or rock unit."
      ],
      "links": [
        [
          "geology",
          "geology"
        ],
        [
          "rock",
          "rock"
        ]
      ],
      "raw_glosses": [
        "(geology) a fragment of rock that was broken from a larger rock or rock unit."
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ],
      "wikipedia": [
        "clast"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/klæst/"
    },
    {
      "audio": "LL-Q1860 (eng)-Vealhurl-clast.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/9/92/LL-Q1860_%28eng%29-Vealhurl-clast.wav/LL-Q1860_%28eng%29-Vealhurl-clast.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/9/92/LL-Q1860_%28eng%29-Vealhurl-clast.wav/LL-Q1860_%28eng%29-Vealhurl-clast.wav.ogg"
    },
    {
      "rhymes": "-æst"
    }
  ],
  "word": "clast"
}