to remain; to be left; to have as remainder

to remain; to be left over; what remains; what's left

leftovers (food)

leftover food

(coll.) "leftover woman" – a woman who remains single beyond the typical marrying age

(coll.) "leftover man" – a man who remains single beyond the typical marrying age

residual magnetism

to have money left; remaining money

(economics) surplus value

the Remainder Theorem

residual radiation

residual radioactivity