Hōanga, n. A kind of sandstone used in the process of cutting and grinding stone implements. Tenei te hoanga te takoto i raro nei, waiho kia oroia ana, he whati toki nui (M. 37). Na ka ki te waha o te hoanga, “Kia koi, kia koi, kia koi,” na kua koi (Tr. vii, 46).
The terms matanui and matarehu indicated the coarse and fine grain respectively of the hoanga.
Williams Dictionary