Definition of sleeping pill noun from the Oxford Advanced Learner's Dictionary

 

sleeping pill

 noun
noun
BrE
 
; NAmE
 
(British English also sleeping tablet) Medication
 
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a pill containing a drug that helps you to sleep More Like This Compound nouns with –ing forms airing cupboard, answering machine, asking price, baking powder, betting shop, boarding school, booking office, bowling alley, breathing space, breeding ground, changing room, clotting factor, cutting room, draining board, drinking water, eating apple, housing estate, icing sugar, living room, meeting place, nursing home, punching bag, racing car, sleeping pill, starting point, tuning fork, waiting room, working partySee worksheet. See related entries: Medication
See the Oxford Advanced American Dictionary entry: sleeping pill