Definition of lactose noun from the Oxford Advanced Learner's Dictionary

 

lactose

 noun
noun
BrE BrE//ˈlæktəʊs//
 
; NAmE NAmE//ˈlæktoʊs//
 
; BrE BrE//ˈlæktəʊz//
 
; NAmE NAmE//ˈlæktoʊz//
 
[uncountable](chemistry)
 
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a type of sugar found in milk and used in some baby foods
See the Oxford Advanced American Dictionary entry: lactose