parol /ˈpæɹ.əl/noun 3adjective 2/pɑˈɹoʊl/ noun 1forms 1 noun3 •A word; an oral utterance. •Oral declaration; word of mouth. •A writing not under seal.Leases , like other conveyances , were good at common law If by deed , by parol — 1765 adjective2 •Word of mouth. •Verbal, oral, informal.Parol, or extrinsic evidence should only be used where it may clarify ambiguous terms of a contract. parol /pɑˈɹoʊl/ noun1 •An ornamental star-like Christmas lantern from the Philippines. formsparols