obstruction
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obstruction
Politics delay of business, esp in a legislature by means of procedural devices
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
obstruction
[əb′strək·shən] (medicine)
Occlusion or stenosis of hollow viscera, ducts, and vessels.
(navigation)
Anything that hinders or prevents movement, particularly anything that endangers or prevents passage of a vessel or aircraft; usually refers to an isolated danger to navigation, such as a submerged rock or pinnacle in the case of marine navigation, and a tower, tall building, mountain peak, and so forth, in the case of air navigation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
obstruction

Obstructions are marked by orange and white colours as well as by lights.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved