Home › Words › L › lugsilllugsill/ˈlʌɡˌsɪl/lugsill means A window sill that extends beyond the width of the window opening, with its ends built into the wall at the jambs.lugsill is pronounced /ˈlʌɡˌsɪl/.EtymologyFrom lug + sill.nounA window sill that extends beyond the width of the window opening, with its ends built into the wall at the jambs.e.g.“On all sides of the exterior, lintels of ashlar form belt courses, while lugsills combine to produce string courses.” — 2025 March 3, Wikipedia contributors, “C. H. Burroughs House”, in English Wikipedia, Wikimedia Foundation:Definitions & examples from Wiktionary (CC BY-SA 3.0).