Superfortress

[ soo-per-fawr-tris ]
/ ˈsu pərˌfɔr trɪs /

noun U.S. Military.

a heavy, long-range, four-engined bomber used during World War II.
Also called B-29, Su·per·fort [soo-per-fawrt, -fohrt] /ˈsu pərˌfɔrt, -ˌfoʊrt/.

Origin of Superfortress

super- + ( flying) fortress