树胶(英语:gum)是植物(主要是木本植物)分泌的黏性物质,主要成分是多糖和多糖衍生物,一般能溶于水。[1]桃胶阿拉伯胶是典型的树胶。若植物的分泌物为树胶和树脂的混合物,则称为胶树脂(英语:gum resin);若为精油、树胶和树脂的混合物,则称为油胶树脂(英语:oleo-gum-resin)。

某些称为树胶的植物产品并非真正的树胶,如加拿大树胶其实是一种油树脂英语oleoresin(英语:oleoresin)。[2]

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