trucial

From truce +‎ -al.

trucial (not comparable)

1. Of or pertaining to a truce; specifically, to the truce obtaining between Britain and various Arab sheikdoms of the Oman peninsula.
   • 2015, Eugene Rogan, The Fall of the Ottomans, Penguin, published 2016, page 283:

     Without staking an explicitly colonial claim to Iraq, Sir Henry asserted […] in essence, the integration of Mesopotamia into Britain's trucial system in the Persian Gulf.

• curtail, urtical