牙
牙，又叫齒，或牙齒，係喺有脊椎動物嘅顎骨上面嘅結構。
牙質地好堅硬，唔同物種嘅牙有唔同形狀、功能。喺同一物種，唔同形狀嘅牙有各種嘅用途。用途包括撕開、磨爛食物。某啲物種，特別係食肉動物，用牙嚟打交、格鬥。有啲物種，據演化論講，用牙嚟吸引異性。
字
牙同齒雖則混用咗好耐，然而當初牙同齒有分別嘅。甲骨文齒字，畫口露出上下門牙，而無止字。而金文牙字，就係上下兩隻大牙交錯扣起，字打橫放，即係臼齒。
文化
廣東
攷
睇埋
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