What is the meaning of Petticoat?

A tight, usually padded undercoat worn by women over a shirt and under the doublet.

A woman's undercoat, worn to be displayed beneath an open gown.

A fisherman's loose canvas or oilcloth skirt.

A type of ornamental skirt or underskirt, often displayed below a dress; chiefly in plural, designating a woman's skirts collectively.

A light woman's undergarment worn under a dress or skirt, and hanging either from the shoulders or (now especially) from the waist; a kind of slip, worn to make the skirt fuller, or for extra warmth.

A woman.

A bell-mouthed piece over the exhaust nozzles in the smokebox of a locomotive, strengthening and equalising the draught through the boiler-tubes.

To dress in a petticoat.

Feminine; female; involving a woman.

Source: wiktionary.org