ob·struc·tion (əb-strŭkshən, ŏb-)
1. Something that obstructs; an obstacle: We drove around the obstruction in the road.
a. The act of obstructing: The protesters' obstruction of the hallway made it impossible to get to the office.
b. The condition of being obstructed: The obstruction of the tunnel lasted for hours.
3. Sports The act of impeding another player in violation of the rules, as when a player impedes the progress of an opponent not in possession of the puck in ice hockey.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.