/vin'i geuh roohn"/ , n.
a large, nonpoisonous whipscorpion, Mastigoproctus giganteus, of the southern U.S. and Mexico, which, when disturbed, emits a volatile fluid having a vinegary odor.
[ 1850-55, Amer.; vinagrón, equiv. to Sp vinagr ( e ) VINEGAR + -ón aug. suffix ]