硬脂精是甘油的三硬脂酸酯类，为动物脂肪的组成成分之一。也叫硬脂酸甘油酯或三硬脂酸甘油酯。

无色无味无臭结晶或粉末。不溶于水、乙醚和里格罗因（ligroin），溶于乙醇、氯仿、二硫化碳。可在酸或碱溶液中水解为硬脂酸和甘油。与氢氧化钠作用得到硬脂酸钠。

Stearin /ˈstɪərᵻn/, or tristearin, or glyceryl tristearate is a triglyceride derived from three units of stearic acid. Most triglycerides are derived from at least two and more commonly three different fatty acids. Like other triglycerides, stearin can crystallise in three polymorphs. For stearin, these melt at 54 (α-form), 65, and 72.5 °C (β-form).