tohunga whakaatu
1. (noun) expert witness.
He wā kua puta ake ia hei tohunga whakaatu mō ngā tono whenua, i kōkiritia ai ngā tikanga me ngā herenga a te Māori i raro i te Tiriti (TTR 1996:115). / Occasionally, he appeared as an expert witness on land claims, and invoked Māori rights and obligations under the Treaty.