term:

Parol

parol n

[Anglo-French, speech, talk, from Old French parole]
: an oral declaration or statement [where the evidence of the gift rests in “Matter of Cohn, 176 N.Y.S. 225 (1919) (dissent)”]
adj 1 : executed or made by word of mouth or by a writing not under seal [a agreement]
2 a : given or expressed by word of mouth
: oral as distinguished from written
b : relating to matters outside of a writing