"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": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Geology",
          "orig": "en:Geology",
          "parents": [
            "Earth sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Rocks",
          "orig": "en:Rocks",
          "parents": [
            "Geology",
            "Natural materials",
            "Earth sciences",
            "Materials",
            "Nature",
            "Sciences",
            "Manufacturing",
            "All topics",
            "Human activity",
            "Fundamental",
            "Human behaviour",
            "Human"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "crystalloclast"
        },
        {
          "word": "interclast"
        },
        {
          "word": "porphyroclast"
        }
      ],
      "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/"
    },
    {
      "rhymes": "-æst"
    },
    {
      "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",
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      "tags": [
        "Southern-England"
      ],
      "text": "Audio (Southern England)"
    }
  ],
  "word": "clast"
}

{
  "derived": [
    {
      "word": "crystalloclast"
    },
    {
      "word": "interclast"
    },
    {
      "word": "porphyroclast"
    }
  ],
  "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 1-syllable words",
        "English back-formations",
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English nouns",
        "English terms with IPA pronunciation",
        "English terms with audio links",
        "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/"
    },
    {
      "rhymes": "-æst"
    },
    {
      "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",
      "tags": [
        "Southern-England"
      ],
      "text": "Audio (Southern England)"
    }
  ],
  "word": "clast"
}