Webster’s Revised Unabridged Dictionary · 1913
M'-Naught
M'-Naught′ (mak·na̤t′), v. t. (Steam Engines) To increase the power of (a single-cylinder beam engine) by adding a small high-pressure cylinder with a piston acting on the beam between the center and the flywheel end, using high-pressure steam and working as a compound engine, — a plan introduced by M'Naught, a Scottish engineer, in 1845.