From The Collaborative International Dictionary of English v.0.48 [gcide]:
Cabriolet \Cab`ri*o*let"\, n. [F., dim. of cabriole a leap,
caper, from It. capriola, fr. dim. of L. caper he-goat, capra
she-goat. This carriage is so called from its skipping
lightness. Cf. Cab, Caper a leap.]
A one-horse carriage with two seats and a calash top.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
cabriolet
n 1: small two-wheeled horse-drawn carriage; with two seats and
a folding hood [syn: cab, cabriolet]