Definition of “soporific” - English Dictionary

“soporific” in British English

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soporificadjective

uk /ˌsɒp.ərˈɪf.ɪk/ us /ˌsɑː.pəˈrɪf.ɪk/

causing sleep or making a person want to sleep:

the soporific effect of the heat
soporifically
adverb uk /ˌsɒp.ərˈɪf.ɪ.kəl.i/ us /ˌsɑː.pəˈrɪf.ɪ.kəl.i/

(Definition of “soporific” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)