verjuice

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Concise Dictionary of English Usage.
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The Word of the Day for May 5 is:

verjuice   \VER-joos\   noun
   *1 : the sour juice of crab apples or of unripe fruit (as 
grapes or apples);  also : an acid liquor made from verjuice
     2 : acidity of disposition or manner

Example sentence:
     "The other women took to their Bibles and hymnbooks, and 
looked as sour as verjuice over their reading." (Wilkie Collins, 
_The Moonstone_)

Did you know? 
     "Verjuice" has been getting some attention lately -- as one 
source put it, it's "a recent buzzword on the culinary scene." 
For those of us not on the culinary edge, verjuice is a tart, 
pale juice pressed from unripe white grapes, ideal for use in 
sauces and salad dressings. Verjuice has been around for 
centuries and is used in Dijon mustard, but the word (a 
descendant of Anglo-French "vert," meaning "green," and "jous," 
meaning "juice") was largely forgotten by English speakers until 
its "rediscovery" in the early 90s. While it's apparent 
that "verjuice" has returned to our kitchens, the same can't yet 
be said of the literary scene. Writers have not generally begun 
to write of  "dispositions of verjuice" the way they did in the 
past. 
 
*Indicates the sense illustrated in the example sentence.