Pōtaka. 1. n. Top; generally whipping top, which is sometimes called potaka ta; a humming-top being potaka takiri. Potaka whero-rua, potaka ko ore rua, or potaka tikitiki, a whipping top pointed at both ends.
2. a. In the expression umu potaka or imu potaka, a sacred oven connected with certain ritual. Ko te umu potaka ma te tokomaha e kai.
Williams Dictionary