trucial

adjective

tru·​cial

ˈtrüshəl,

-üsēəl

often capitalized

: of, relating to, or involving several territorial areas in the vicinity of the Persian Gulf for which the government of Great Britain formerly assumed responsibility nominally in an advisory capacity

nearly 400 miles of coast belongs to the Trucial sheikhs

—Americana Annual

Word History

Etymology

truce entry 1 + -ial; from the maritime truce made in 1835 between the British government and several Arab states of the Oman peninsula

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