adjective, often capitalized
tru·​cial | \ ˈtrüshəl, -üsēəl\

Definition of trucial

: 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 sheikhsAmericana Annual

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History and Etymology for trucial

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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