Definition of protectorial in US English:

protectorial

adjective

  • Of or relating to a protector or protectorate; = "protectoral".

Origin

Mid 18th century; earliest use found in The London Magazine. Either from post-classical Latin protectorius protectory + -al, or from protector + -ial.

Pronunciation

protectorial

/prəˌtɛkˈtɔːrɪəl/