礫
一連の爆発で、その研究施設は瓦礫の山と化した。
A series of blasts reduced the laboratory to ruins.
校舎の跡地は瓦礫の山となっている。
There is a large pile of rubble where the school building used to be.
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The search results are provided by the wonderful Jisho API which itself uses various data sources which you can find on the jisho's website. The data concerning the kanji strokes are provided by the KanjiVG project, under the CC BY 3.0 FR license. I also use Tatoeba to provide example sentences and Kuroshiro to obtain the furiganas and romajis versions of the sentences.
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