In the middle of a ship (as opposed to bow or stern).(adverb)
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Use "amidship" in a sentence
"We raked out the bo'sun from his afternoon nap, and he and a withered old lascar jammed a hemp fender between the chain and woodwork, so their slumbers ought to be more peaceful; now they are getting a temporary change to a berth amidship, which is unoccupied as far as Marseilles; in it they will hardly feel the motion."
""amidship" if one may use that term concerning an airship."
"His voice was still ringing, and the men were just beginning to move in obedience, when the amidship deck of the Pyrenees, in a mass of flame and smoke, was flung upward into the sails and rigging, part of it remaining there and the rest falling into the sea."