soporific
adjective/ˌsɒpəˈrɪfɪk/
/ˌsɑːpəˈrɪfɪk/
(formal)- making you want to go to sleep
- the soporific effect of the sun
Oxford Collocations DictionarySoporific is used with these nouns:- effect
Word Originmid 17th cent.: from Latin sopor ‘sleep’ + -ific.Definitions on the go
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soporific