frock coat

a man's close-fitting, knee-length coat, single-breasted or double-breasted and with a vent in the back.

Origin of frock coat

First recorded in 1735–45

frn, fro, fro-yo, frobisher, frock, frock coat, frock tart, frocking, froe, froebel, frog

He was in a frock-coat that reached his heels, in a high cap, and he carried a huge umbrella in his hand.

Foma Gordyeff |Maxim Gorky
At this moment I find that my handkerchief has left the pocket of my frock-coat.

The Crime of Sylvestre Bonnard |Anatole France
He wore a frock-coat, buttoned up, and a very high collar which enclosed the lower part of his face.

Paris |William Walton
Therefore on land he ever afterwards wore a frock-coat, except when in evening dress or pyjamas.

The Burglars' Club |Henry A. Hering

He was, as usual, attired in a frock-coat and grey trousers.

The Burglars' Club |Henry A. Hering

frock coat

a man's single- or double-breasted skirted coat, as worn in the 19th century