en·cyc·li·cal
noun/ɪnˈsɪklɪkl/
/ɪnˈsɪklɪkl/
- an official letter written by the Pope and sent to all Roman Catholic bishops
教皇通谕 Word Originmid 17th cent. (as an adjective): via late Latin from Greek enkuklios ‘circular, general’, from en- ‘in’ + kuklos ‘a circle’.