o ‧ pi ‧ um /ˈəʊpiəm $ ˈoʊ-/ BrE AmE noun [uncountable]
[ Date: 1300-1400 ; Language: Latin ; Origin: Greek opion , from opos 'plant juice' ]
a powerful illegal drug made from ↑ poppy seeds. Drugs made from opium are used to reduce severe pain. ⇨ heroin