cabriolet

1. A two-wheeled, one-horse carriage that has two seats and a folding top.
2. An automobile with a folding top; a convertible coupe.

[French, diminutive of cabriole, caper, from obsolete capriole, from Italian capriola, from capriolo, roebuck, from Latin capreolus, masculine diminutive of caprea, roe deer, from caper, he-goat.]

The noun has one meaning:

Meaning #1: small two-wheeled horse-drawn carriage; with two seats and a folding hood
  Synonym: cab