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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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
Therefore, while churning the bottom and emitting sediment into the water,
  there will be huge increases in turbidity.
Sediment waves form as turbidity currents spill out of the canyons.
Turbidity is the amount of particulate matter that is suspended in water.
Turbidity has no health effects, but can interfere with disinfection and
  provide a medium for microbial growth.
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