Webster's Revised Unabridged Dictionary · 1913

Petticoat

Petticoat , noun

[Petty + coat.]

(Zoology) A loose under-garment worn by women, and covering the body below the waist.
Collocations (2)
Petticoat government , government by women, whether in politics or domestic affairs. [Colloquial]
Petticoat pipe (Locomotives) , a short, flaring pipe surrounding the blast nozzle in the smoke box, to equalize the draft.