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Related to Plimsoll mark: Plimsoll line
Plimsoll mark[′plim·səl ‚märk]
A circular disk with a horizontal line placed on the side of a ship to indicate the summer load line.
A series of marks on the side of a ship indicating the load line for various seasons and geographical areas.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.