Sour plum

Sour Sour, a. [Compar. {Sourer}; superl. {Sourest}.] [OE. sour, sur, AS. s?r; akin to D. zuur, G. sauer, OHG. s?r, Icel. s?rr, Sw. sur, Dan. suur, Lith. suras salt, Russ. surovui harsh, rough. Cf. {Sorrel}, the plant.] 1. Having an acid or sharp, biting taste, like vinegar, and the juices of most unripe fruits; acid; tart. [1913 Webster]

All sour things, as vinegar, provoke appetite. --Bacon. [1913 Webster]

2. Changed, as by keeping, so as to be acid, rancid, or musty, turned. [1913 Webster]

3. Disagreeable; unpleasant; hence; cross; crabbed; peevish; morose; as, a man of a sour temper; a sour reply. ``A sour countenance.'' --Swift. [1913 Webster]

He was a scholar . . . Lofty and sour to them that loved him not, But to those men that sought him sweet as summer. --Shak. [1913 Webster]

4. Afflictive; painful. ``Sour adversity.'' --Shak. [1913 Webster]

5. Cold and unproductive; as, sour land; a sour marsh. [1913 Webster]

{Sour dock} (Bot.), sorrel.

{Sour gourd} (Bot.), the gourdlike fruit {Adansonia Gregorii}, and {A. digitata}; also, either of the trees bearing this fruit. See {Adansonia}.

{Sour grapes}. See under {Grape}.

{Sour gum} (Bot.) See {Turelo}.

{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. [1913 Webster]

Syn: Acid; sharp; tart; acetous; acetose; harsh; acrimonious; crabbed; currish; peevish. [1913 Webster]