dreadnought (n.)

literally (one who or that which) "fears nothing," from the verbal phrase (drede ich nawiht is attested from c. 1200); see dread (v.) + nought (n.). As a synonym for "battleship" (1916) it is from a specific ship's name. Dreadnought is mentioned as the name of a ship in the Royal Navy as early as c. 1596, but the modern generic sense is from the name of the first of a new class of British battleships, based on the "all big-gun" principle (armed with 10 big guns rather than 4 large guns and a battery of smaller ones), launched Feb. 18, 1906.