sop ‧ o ‧ rif ‧ ic /ˌsɒpəˈrɪfɪk◂ $ ˌsɑː-/ BrE AmE adjective formal
[ Date: 1600-1700 ; Language: French ; Origin: soporifique , from Latin sopor 'deep sleep' ]
making you feel ready to sleep:
His voice had an almost soporific effect.
sop ‧ o ‧ rif ‧ ic /ˌsɒpəˈrɪfɪk◂ $ ˌsɑː-/ BrE AmE adjective formal
[ Date: 1600-1700 ; Language: French ; Origin: soporifique , from Latin sopor 'deep sleep' ]
making you feel ready to sleep:
His voice had an almost soporific effect.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012