'roundblade' originates from English, specifically the combination of the Old English elements 'rund' (later 'round') and 'blæd' ('blade'), where 'rund' meant 'round' and 'blæd' meant 'leaf' or 'blade'.

'roundblade' developed as a descriptive compound in later English (e.g. Early Modern English forms like 'round-blade'), and through continued use as a technical compound the modern concatenated form 'roundblade' became established.

Initially it simply described 'a blade that is round in shape'; over time it has been used as a more specific name for circular cutting parts in tools and machinery.