the.com/divisor

means The number you divide by — the one that splits another number into equal parts.

from From Latin dividere, 'to divide, force apart,' built from di- (apart) and videre... no — actually from the root related to viduus (bereft, separated), giving divid- (split) plus -or, the Latin agent suffix meaning 'the one that does it.' So a divisor is literally 'the divider,' the agent noun sitting alongside dividend, the thing divided. Both entered English through Latin arithmetic vocabulary in the late medieval period, as scholars translated classical math texts.