Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: French
Origin: soporifique, from Latin sopor 'deep sleep'

soporific

 adjective
     
sop‧o‧rif‧ic formal
making you feel ready to sleep:
His voice had an almost soporific effect.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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