[经] 口头合同

Parol \Pa*rol"\, a.
Given or done by word of mouth; oral; also, given by a
writing not under seal; as, parol evidence.

{Parol arrest} (Law), an arrest in pursuance of a verbal
order from a magistrate.

{Parol contract} (Law), any contract not of record or under
seal, whether oral or written; a simple contract.
--Chitty. Story.