Definition of refunder in US English:

refunder

noun

  • A person who or thing which repays or returns something; (now chiefly) a person who or thing which gives a refund.

noun

  • A person who or thing which refunds.

Origin

Late 17th century; earliest use found in Thomas Brown (bap. 1663, d. 1704), writer. From refund + -er<br>late 19th century; earliest use found in The Columbus Dispatch. From refund + -er.