Pronunciation: (rez'i-dOO", -dyOO"),[key] —n. 1. something that remains after a part is removed, disposed of, or used; remainder; rest; remnant.
2. Chem. a. residuum (def. 2).
b. an atom or group of atoms considered as a group or part of a molecule.
c. that part remaining as a solid on a filter paper after a liquid passes through in the filtration procedure.
3. Law.the part of a testator's estate that remains after the payment of all debts, charges, special devises, and bequests.
4. Math. a. the coefficient of the term with exponent -1 in a Laurent series of a function of a complex variable.
b. a number related to a given number by a congruence.