remainder (n.)

late 14c., from Anglo-French remainder, Old French remaindre, noun use of infinitive, a variant of Old French remanoir "to stay, dwell, remain; be left; hold out," from Latin remanere "to remain, to stay behind; be left behind; endure, abide, last" (source also of Old Spanish remaner, Italian rimanere), from re- "back" (see re-) + manere "to stay, remain" (from PIE root *men- (3) "to remain"). The verb meaning "dispose of (books) at a reduced price" is from 1904. Related: Remaindered.