porterhouse

1. A cut of beef taken from the thick end of the short loin, having a T-bone and a sizable piece of tenderloin. Also called porterhouse steak.
2. Archaic. An alehouse or chophouse.

American term originally for large beef steak cut from the rear end of sirloin and including some fillet: served with beer (porter) in porterhouses. Now a thick slice cut from the wing-rib of beef.

The noun has one meaning:

Meaning #1: large steak from the thick end of the short loin containing a T-shaped bone and large piece of tenderloin
  Synonym: porterhouse steak