Nganga (ii), n. 1. Stone of fruit. Nganga tawhiti, a variety of potato.
2. Hail. Te ua nganga, e, homai ki to kiri (M. 430).
3. Core of a boil. Ki te puta te nganga o te whewhe ki waho, ka ora.
4. Dregs, refuse.
5. Shell, husk, of shell fish, fruits, etc.
6. Soot. Nganga kauri.
Williams Dictionary