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尿素,正名碳醯二胺,一云脲,官品也,式CON2H4、(NH2)2CO、CN2H4O。重六十,合碳、氮、氧、氫而成,乃一白色晶體,或粉狀,有毒。出獸朊之代謝,可為氮肥。
昔人未能合成之,而尿素者,有機化合物也。遂斷曰,凡人創之化合物,皆無機。然德人維勒,竟以氰酸鉀共硫酸銨而得尿素。於是,不復稱合成化合物稱曰無機。
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