Lewis & Short

căpistro (āvi), ātum, 1, v. a. [capistrum].

  1. I. To halter, tie with a halter: jumenta, Col. 6, 19, 2; Plin. 18, 19, 49, § 177; Ov. H. 2, 80; Sid, Carm. 22, 23.
  2. * II. Transf., of the vine, to bind fast, to fasten, Col. 11, 2, 95.