Panamax
n.—Gloss: a cargo ship built to be small enough to go through the Panama Canal. «The Panama Canal is so important to world shipping that the trade has invented a word to describe ships that will fit through it. A “Panamax” cargo ship is one with a maximum width of 106 feet and a maximum draft of 41 feet.» —“Port Manatee plans to make up for lost time” by Michael Pollick Herald Tribune (Sarasota, Florida) Oct. 29, 2007. (source: Double-Tongued Dictionary)