Is there a word for "kosher"?
Depending on the context, there are different strategies for translating this word. In the most strict sense, leaving nothing unsaid, it is （符）合犹太教规的 when it comes to food preparation. If reference to 犹太教 isn't essential to the context, it can simply be 合礼法的, because the notion of doing things according to 礼法 is prevalent in Chinese culture.