the.com/divisor
The number doing the splitting, blissfully unaware it might land you a fraction.
means The number you divide by — the quantity carving another quantity into equal parts.
from From Latin divisor, agent noun of dividere, to force apart — literally the thing that does the dividing.
Zero forbiddenAs a divisor it breaks arithmetic entirely.
LineupIn a divided b, b is the divisor.
Factor cousinA divisor of a number leaves no remainder.