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