• Webster's Revised Unabridged Dictionary
    • Vinaigrous Resembling vinegar; sour.
    • Vinaigrous Unamiable; morose.
    • ***
Century Dictionary and Cyclopedia
    • vinaigrous Sour like vinegar; hence, crabbed, peevish, or ill-tempered.
    • ***
Chambers's Twentieth Century Dictionary
    • adj Vinaigrous sour like vinegar, ill-tempered
    • ***


Webster's Revised Unabridged Dictionary
F. vinaigre, vinegar
Chambers's Twentieth Century Dictionary
Fr. vinaigrevin (L. vinum, wine), aigre—L. acer, sour.


In literature:

After leaving the spring, we continued some way further towards the Rio Vinaigre, or Vinegar River.
"In New Granada" by W.H.G. Kingston
If the weather was good, we should climb Mont Vinaigre, and see the Esterel from its highest point.
"Riviera Towns" by Herbert Adams Gibbons
Pique-Vinaigre excelled in that kind of heroic tales in which weakness, after a thousand trials, concludes by triumphing over persecution.
"The Mysteries of Paris, Volume 5 of 6" by Eugène Sue
Our destination was a casa de huespedes (half inn, half boarding-house) called "La Vinaigre," and the name was not altogether unsuitable.
"Poor Folk in Spain" by Jan Gordon