not clear or transparent because of stirred-up sediment or the like; clouded; opaque; obscured: the turbid waters near the waterfall.
thick or dense, as smoke or clouds.
confused; muddled; disturbed.

1620–30; < Latin turbidus disturbed, equivalent to turb(āre) to disturb (derivative of turba turmoil) + -idus -id4

turbidity, turbidness, noun
turbidly, adverb
unturbid, adjective
unturbidly, adverb

1. torpid, turbid, turgid ; 2. turbid, turgid.

1. murky, cloudy, roiled, muddy.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
turbid (ˈtɜːbɪd)
1.  muddy or opaque, as a liquid clouded with a suspension of particles
2.  dense, thick, or cloudy: turbid fog
3.  in turmoil or confusion
[C17: from Latin turbidus, from turbāre to agitate, from turba crowd]

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

1626, from L. turbidus "muddy, full of confusion," from turbare "to confuse, bewilder," from turba "turmoil, crowd," probably from Gk. tyrbe "turmoil."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

turbid tur·bid (tûr'bĭd)
Having sediment or foreign particles stirred up or suspended; muddy; cloudy.

tur·bid'i·ty n.
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
Nineteen divers toiled for three months in water so turbid that they had to
  work more by touch than sight.
The water is also more turbid, which prevents growing phytoplankton from
  receiving enough light.
But the undertow was too strong even for them, and the currents made the water
  turbid and difficult to see in.
Turbid ice is widespread but not universally present.
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