residue

UK: /ˈrɛzɪdjuː/

US: /ˈrɛzɪˌdu, -ˌdju/

US: (rez′i do̅o̅′, -dyo̅o̅′)

WordReference Random House Learner's Dictionary of American English © 2025

res•i•due /ˈrɛzɪˌdu, -ˌdyu/   n. [countable]

1. something that remains after a part is removed, disposed of, or used;
   remainder;
   the rest;
   a remnant:
   Residues from chemical pesticides could harm children.

See -sid-.

WordReference Random House Unabridged Dictionary of American English © 2025

res•i•due  (rez′i do̅o̅′, -dyo̅o̅′), n. 

1. something that remains after a part is removed, disposed of, or used;
   remainder;
   rest;
   remnant.
2. Chemistry
   • residuum (def. 2).
   • an atom or group of atoms considered as a group or part of a molecule.
   • 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. Mathematics
   • the coefficient of the term with exponent -1 in a Laurent series of a function of a complex variable.
   • a number related to a given number by a congruence.

• Latin residuum what is left over; see residual
• Middle French residu
• Middle English 1300–50

Synonyms

• 1. remains, residuum. See remainder. 

Collins Concise English Dictionary © HarperCollins Publishers::

residue / ˈrɛzɪˌdjuː/ noun

1. matter remaining after something has been removed
2. what is left of an estate after the discharge of debts and distribution of specific gifts

Etymology: 14th Century: from Old French residu, from Latin residuus remaining over, from residēre to stay behind, reside