Webster's 1913 Dictionary
CAVESSON; CAVEZON
Cav "es *son, Cav "e *zon, n. Etym: [F. caveçon, augm. fr. LL. capitium a head covering hood, fr. L. caput head. Cf. Caberzon.] (Man. )
Defn: A kind of noseband used in breaking and training horses. [Written also caveson, causson.] White.
New American Oxford Dictionary
cavesson
cav es son |ˈkavəsən ˈkævəsən | ▶noun (also lunging cavesson ) a type of heavy bridle, which lacks a bit and has a thick noseband fitted with rings to which a lunge rein may be attached. ORIGIN late 16th cent.: from French caveçon, Italian cavezzone, based on Latin caput ‘head. ’
Oxford Dictionary
cavesson
cavesson |ˈkavɪs (ə )n | ▶noun a type of heavy bridle which lacks a bit and has a thick noseband fitted with rings to which a rein may be attached. • a simple noseband on a horse's bridle. ORIGIN late 16th cent.: from French caveçon, Italian cavezzone, based on Latin caput ‘head ’.