肥膏(粵拼:fei4 gou1,Fat),學名脂肪(粵拼:zi1 fong1),係室溫之下嘅固態油(室溫下呈液態嘅油脂叫做油),多數嚟自動物體內嘅脂肪組織,係一種羧酸酯,由碳、氫、氧三種元素組成。相對醣,脂肪所含碳、氫比例較高,而氧嘅比例較低。
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