What is "cardrooms"

Usage examples of "cardrooms".

Two hours after midnight the Marine band was playing the less strenuous airs for the lovers and romantics who still circled the ballroom floor, but most of the company had gone up to the cardrooms on the first floor, if not to play themselves, then to crowd around the tables and watch with hushed attention and the occasional bursts of applause at a particularly audacious or successful coup.