On-line Te Reo Māori Dictionary

Arero, n. 1. Tongue. Ka naomia atu te tangata ra, ka tapahia te arero, ka motu (T. 42).

2. Upper point of a taiaha, carved in imitation of a human tongue.

whakaarero, n. A projection from the top of the wall of a fort to enable defenders to drop missiles upon their assailants.

Williams Dictionary