grêlon bedeutet auf Englisch

hailstone▼◼◼◼(single ball of hail)
noun
[UK: ˈheɪl.stəʊn] [US: ˈheɪlˌstoʊn]The hailstones were as big as tennis balls. = Les grêlons étaient gros comme des balles de tennis.

hail▼◼◼◼(balls of ice)
noun
[UK: heɪl] [US: ˈheɪl]