R is for

Remainder – what is left of, amount left over after division, unsold book, interest in somebody else’s estate

What’s left of – get that. Amount left over after division – elementary school learning. Unsold book?  Once again, I am learning things here. I can understand that what is not sold is a remainder but why books in particular? Why, for instance, aren’t the gourds that don’t get sold at Farmers Market called the remainder? Perhaps some clerk, returning to the shop said to the owner, “here is the remainder” meaning what they didn’t sell and it sort of caught on in that shop. Then the shop owner used with his supplier and they started using it too – and so on.