noun: (baseball) Initialism of designated hitter. [(baseball) A batter who is permitted to substitute for a pitcher in the batting rotation for the duration of a baseball game.]
noun: (aviation) Initialism of decision height. [(aviation) The height at which a pilot performing a precision approach must decide whether to land on the runway or to perform a go-around maneuver.]
noun: (military, nautical) Initialism of heavy destroyer, a variant of the destroyer type of warship.
noun: Initialism of deputy head.
noun: Initialism of dear/darling husband.
noun: Abbreviation of Diffie–Hellman (key exchange).
