parol evidence rule(n = noun.communication) - a rule that oral evidence cannot be used to contradict the terms of a written contract;
is a kind of rule of evidence
algorithmic rule, as a rule, best evidence rule, board rule, carpenter's rule, circumstantial evidence, cogent evidence, corroborating evidence, direct evidence, evidence, exclusionary rule, foot rule, footprint evidence, gag rule, golden rule, grammatical rule, ground rule, hearsay evidence, hearsay rule, heuristic rule, home rule, in evidence, indirect evidence, linguistic rule, majority rule, miranda rule, mob rule, morphological rule, naegele's rule, one-man rule, parol, phase rule, plumb rule, procrustean rule, rule, rule book, rule in, rule of cy pres, rule of evidence, rule of grammar, rule of law, rule of morphology, rule of thumb, rule out, slide rule, state's evidence, work to rule, working rule