The Collaborative International Dictionary of English v.0.48:

Parol \Pa*rol"\, n. [See Parole, the same word.]
   [1913 Webster]
   1. A word; an oral utterance. [Obs.]
      [1913 Webster]

   2. (Law) Oral declaration; word of mouth; also, a writing not
      under seal. --Blackstone.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Parol \Pa*rol"\, a.
   Given or done by word of mouth; oral; also, given by a
   writing not under seal; as, parol evidence.
   [1913 Webster]

   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.
      [1913 Webster]