Lewis & Short

căpillāmentum, i, n. [capillus].

  1. I. The hair, collect., Plin. 16, 10, 16, § 38; esp. false hair, a peruke, Suet. Calig. 11; Petr. 110, 5, Tert. Cult. Fem. 7.
  2. II. Transf.
    1. A. The hairy threads or fibres of the roots or leaves of plants, etc.: capillamenta vitis, Sen. Ep. 86, 20: seminum, Col. 4, 11, 1; 4, 22, 4: radicum, Plin. 19, 6, 31, § 99; 27, 12, 80, § 105.
    2. B. Hair-like streaks on precious stones: rimae simile, Plin. 37, 2, 10, § 28; 37, 5, 18, § 68.