Across-wing is an addition to a house, at right angles to the original block of a house, usually with agable. Across-wing plan is anarchitectural plan reflecting this;cross-wing architecture describes the style.
James Stevens Curl, inA Dictionary of Architecture and Landscape Architecture, defines it as a "Wing attached to the hall-range of a medieval house, its axis at right angles to the hall-range, and often gabled."[1]
Cross-wing plans have been used in other eras. For example, during the settlement period in Utah in the late 1800s, original smallhall-and-parlor plan houses, often built in vernacularClassical Revival style, were sometimes extended by the addition of aVictorian-style cross-wing.[2]