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Related to can buoy: nun buoy
can buoy[′kan ‚bȯi]
Floating cylindrical unlighted buoy with a flat top, constructed of metal; depending on position, it may be painted black with or without an odd number on it, or painted with horizontal stripes.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.