Morpheme
Frain
Type
bound base
Denotation
fit a bridle, curb, restrain, check, brake
Etymology
Middle English -freinen, -reynen; Anglo-Norman -frener; Old French -frener, -fraigner, -freiner; Latin frēnāre, from frēnum
Evidence
refrain, refrained, refrainer, refraining, refrainment, refrains, unrefrained, unrefraining