The Collaborative International Dictionary of English v.0.48:
B-52 \B-52\ n. A large long-range bomber airplane of the U. S. military aircraft fleet; B- stands for bomber. It has the capability of delivering nuclear weapons. [WordNet 1.5 +PJC]WordNet (r) 3.0 (2006):
B-52 n 1: United States military aircraft; B- stands for bomber