rubstone

[ ruhb-stohn ]

noun

1. a stone, especially a whetstone, used for polishing or sharpening.

rubstone

/ ˈrʌbˌstəʊn /

noun

1. a stone used for sharpening or smoothing, esp a whetstone

Word History and Origins

Origin of rubstone¹

late Middle English word dating back to 1400–50; rub, stone