The Collaborative International Dictionary of English v.0.48:

Acetose \Ac"e*tose`\ ([a^]s"[-e]*t[=o]s`), a.
   Sour like vinegar; acetous.
   [1913 Webster]

WordNet (r) 3.0 (2006):

acetose
    adj 1: tasting or smelling like vinegar [syn: acetose,
           acetous, vinegary, vinegarish]