From The Collaborative International Dictionary of English v.0.48 :
Pothouse \Pot"house`\, n.
An alehouse. --T. Warton.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
pothouse
n 1: tavern consisting of a building with a bar and public
rooms; often provides light meals [syn: public house,
pub, saloon, pothouse, gin mill, taphouse]