ˈləgsəl ( usual nautical pronunc ), -ˌsāl noun
Etymology: perhaps from lug (IV) + sail
: a four-sided sail bent to a yard that hangs more or less obliquely on a mast slung at about a third or quarter of its length from the forward end and hoisted and lowered with the sail — called also lug ; compare balance lugsail , dipping lug , split lug , standing lug