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weep hole[′wēp ‚hōl]
A hole in a wood sill, retaining wall, or other structure to allow accumulated water to escape.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A small opening in a wall or window member, through which accumulated condensation or water may drain to the building exterior, such as from the base of a cavity wall flashing or a skylight.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
1. A small opening in a wall or window member, through which accumulated condensation or water may drain to the building exterior, as from the base of a cavity wall, a wall flashing, or a skylight.
2. A hole near the bottom of a retaining wall, backfilled with gravel or other free-draining material, to permit water to drain to the outside of the wall, so as to prevent the buildup of pressure behind the wall.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.