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.
Syn. -- Acid; sharp; tart; acetous; acetose; harsh; acrimonious;
crabbed; currish; peevish.
Sour, n. A sour or acid substance; whatever produces a painful effect.
Spenser.
Sour, v. t. [AS. s&?;rian to sour, to become sour.] 1. To cause to
become sour; to cause to turn from sweet to sour; as, exposure to the
air sours many substances.
So the sun's heat, with different powers, Ripens the grape, the
liquor sours.
Swift.