Having an acid or sharp, biting taste, like vinegar, and the juices of most unripe fruits; acid; tart. "All sour things, as vinegar, provoke appetite."
2.
Changed, as by keeping, so as to be acid, rancid, or musty, turned.
3.
Disagreeable; unpleasant; hence; cross; crabbed; peevish; morose; as, a man of a sour temper; a sour reply."A sour countenance.""He was a scholar... Lofty and sour to them that loved him not, But to those men that sought him sweet as summer."
4.
Afflictive; painful. "Sour adversity."
5.
Cold and unproductive; as, sour land; a sour marsh.
Sour dock (Bot.), sorrel.
Sour gourd (Bot.), the gourdlike fruit Adansonia Gregorii, and Adansonia digitata; also, either of the trees bearing this fruit. See Adansonia.
Sour plum (Bot.), the edible acid fruit of an Australian tree (Owenia venosa); also, the tree itself, which furnished a hard reddish wood used by wheelwrights.