hailstone

Từ điển Oxford Advanced Learner 8th

hail·stone [hailstone hailstones] BrE [ˈheɪlstəʊn] NAmE [ˈheɪlstoʊn] noun usually plural
a small ball of ice that falls like rain

Example Bank:
•Britain's biggest recorded hailstone weighed 5 oz.
•We struggled up the hill in a wind full of dust and hailstones.