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

 

hailstone

 noun
noun
BrE BrE//ˈheɪlstəʊn//
 
; NAmE NAmE//ˈheɪlstoʊn//
 
[usually plural] Rain
 
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a small ball of ice that falls like rain Britain’s biggest recorded hailstone weighed 5 oz. We struggled up the hill in a wind full of dust and hailstones. See related entries: Rain
See the Oxford Advanced American Dictionary entry: hailstone