calash

noun

1. Also calèche. a light vehicle pulled by one or two horses, seating two to four passengers, and having two or four wheels, a seat for a driver on a splashboard, and sometimes a folding top.
2. a folding top of a carriage.
3. calèche(def 1).
4. a bonnet that folds back like the top of a calash, worn by women in the 18th century.

noun

1. a horse-drawn carriage with low wheels and a folding top
2. the folding top of such a carriage
3. a woman’s folding hooped hood worn in the 18th century