sharp or biting to the taste or smell; bitterly pungent; irritating to the eyes, nose, etc.: acrid smoke from burning rubber.
extremely or sharply stinging or bitter; exceedingly caustic: acrid remarks.

1705–15; < Latin ācr- (stem of ācer) sharp, sour + -id4, perhaps through influence of acid

acridity [uh-krid-i-tee] , acridness, noun
acridly, adverb
subacrid, adjective
subacridly, adverb
subacridness, noun
subacridity, noun

acerbic, acid, acrid. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
acrid (ˈækrɪd)
1.  unpleasantly pungent or sharp to the smell or taste
2.  sharp or caustic, esp in speech or nature
[C18: from Latin ācer sharp, sour; probably formed on the model of acid]

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

1712, from L. acer (fem. acris) "sharp, pungent, bitter, eager, fierce," from PIE *ak-ri-, from base *ak- "be sharp, rise (out) to a point, pierce" (cf. Oscan acrid "sharply;" Gk. akis "sharp point," akros "at the farthest point, highest, pointed," akantha "thorn," akme "summit, edge;" also oxys "sharp,
bitter;" Skt. acri- "corner, edge," acani- "point of an arrow," asrih "edge;" Lith. asmuo "sharpness," akstis "sharp stick;" O.Ir. er "high;" Welsh ochr "edge, corner, border;" O.N. eggja "goad;" O.E. ecg "sword"). The -id suffix probably is in imitation of acid.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

acrid ac·rid (āk'rĭd)
Unpleasantly sharp, pungent, or bitter to the taste or smell.

a·crid'i·ty (ə-krĭd'ĭ-tē) or ac'rid·ness 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
The vans still smoldered and set an acrid tang in the air which stung bitter in
  the back of the throat.
Aromatic penetrating slightly acrid odor and a slightly bitter caustic taste.
It has a pungent odor and an acrid taste.
The air was growing worse, thin and acrid, bitter smells of oil and wet cloth.
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