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A slight depression, sometimes swampy, in the midst of generally level land.
A shallow depression in an undulating ground moraine due to uneven glacial deposition.
A long, narrow, generally shallow, troughlike depression which lies between two beach ridges and is aligned roughly parallel to the coastline.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
Low area of ground used for drainage and often the infiltration of stormwater.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
1. A tract of low, usually wet land.
2. A depression in a stretch of otherwise flat land.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.