There are only 4 English words that end with “rind”: rind, grind, regrind, and tamarind. Tamarind is a tree, and it is the only one of these in which “rind” is pronounced as one would expect: /rɪnd/. In the other three, it is pronounced as /raɪnd/ (raaynd), so, in particular, “grind” is pronounced /graɪnd/ (graaynd).
Note: “Rind” is the outer skin of some types of fruit, for example “lemon rind”.
Note 2: There is one more word ending with -rind: “Amerind” /ˈæmərɪnd/. This is a coined word referring to American Indians and their languages. It is not universally accepted and listed only in some dictionaries.