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A guide through which an airplane antenna or control cable passes.
A group of pulleys or rollers used in conjunction with a winch or similar apparatus to permit the cable to be reeled from any direction.
A block, ring, or other fitting through which passes a line or the running rigging on a ship to prevent chafing.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.