Definition of soporific adjective from the Oxford Advanced Learner's Dictionary

 

soporific

 adjective
adjective
BrE BrE//ˌsɒpəˈrɪfɪk//
 
; NAmE NAmE//ˌsɑːpəˈrɪfɪk//
 
(formal)
 
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making you want to go to sleep the soporific effect of the sun Wordfinderdoze, dream, drowsy, insomnia, oversleep, REM, sedative, sleep, soporific, tired Word Origin mid 17th cent.: from Latin sopor ‘sleep’ + -ific.
See the Oxford Advanced American Dictionary entry: soporific