1. A two-story cottage having two rooms, one directly over the other; usually the result of the expansion of a cottage having a one-room plan by the addition of a floor above it.
2. A term descriptive of a double-hung window having one pane in the upper sash and one pane in the lower; see pane.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.