double-barrelled
in AM, use double-barreled
1 adj A double-barrelled gun has two barrels.
...a double-barrelled shotgun.
2 adj A double-barrelled surname has two parts which are joined by a hyphen, for example `Miss J. Heydon-Smith'.
(BRIT)
3 adj Double-barrelled is used to describe something such as a plan which has two main parts. (JOURNALISM)