verb (used with object)
to block or close up with an obstacle; make difficult to pass: Debris obstructed the road.
to interrupt, hinder, or oppose the passage, progress, course, etc., of.
to block from sight; to be in the way of (a view, passage, etc.).

1605–15; < Latin obstructus (past participle of obstruere to build or pile up in the way, bar). See ob-, construct

obstructedly, adverb
obstructer, obstructor, noun
obstructingly, adverb
obstructive, adjective
obstructively, adverb
obstructiveness, obstructivity [ob-struhk-tiv-i-tee] , noun
nonobstructive, adjective
nonobstructively, adverb
nonobstructiveness, noun
preobstruct, verb (used with object)
unobstructed, adjective
unobstructive, adjective

1. stop, choke, clog, hinder, impede, prevent; check, slow, retard, arrest.

1. encourage, further.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
obstruct (əbˈstrʌkt)
1.  to block (a road, passageway, etc) with an obstacle
2.  to make (progress or activity) difficult
3.  to impede or block a clear view of
[C17: Latin obstructus built against, past participle of obstruere, from ob- against + struere to build]
adj, —n

unobstructed (ˌʌnəbˈstrʌktɪd)
(of a passageway, view, etc) not blocked by any object

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1650s, from un- (1) "not" + pp. of obstruct.

1610s, from L. obstructus, pp. of obstruere "to block, to stop up" (see obstruction). Related: Obstructed; obstructing.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

obstruct ob·struct (əb-strŭkt', ŏb-)
v. ob·struct·ed, ob·struct·ing, ob·structs
To block or close a body passage so as to hinder or interrupt a flow.

ob·struc'tive adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Wind turbines function best in wide-open spaces where they can capture airflow
  unobstructed by buildings or mountains.
Because cars don't have to wait for a signal, but can proceed unobstructed.
They'll have to find a spot where their view of the sky is unobstructed but the
  moon is blocked out by trees or a building.
Also on the south side are several acres of gardens that offer unobstructed
  bridge views.
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