acerbo-, acerb- (Latin: bitter, sharp, sour, stinging).acerb, acerbic: 
Having a bitter or sour taste; sharp or bitter in temper, mood, or expression.
 
acerbate: 
To irritate or annoy.
 
acerose: 
Sharp pointed and slender, as a pine needle.
 
acerbity: 
Sourness of taste, with bitterness and astringency, as of unripe fruit; harseness, bitterness, or severity; as, acerbity of temper, of language, or of pain.
 
acerbophobia: 
An abnormal fear of sour or bitter tasting foods or liquids.
 
exacerbate, exacerbating : To increase the severity of, aggravate; to irritate.
exacerbation: 
Increase in the severity of a disease or any of its symptoms, as in a continuous fever.
 
exacerbescence, exacerbescent: 
Showing violence or bitterness; an irritation.
 
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