[1] : The Collaborative International Dictionary of English v.0.48

sorrel \sor"rel\, a. f. saur, saure, of. sor, sore, probably of
   teutonic origin; cf. d. zoor dry, lg. soor; the meaning
   probably coming from the color of dry leaves. see sear, a.,
   and cf. sorel.
   of a yellowish or redish brown color; as, a sorrel horse.
   1913 webster
see also:
sear sorel 

[2] : The Collaborative International Dictionary of English v.0.48

sorrel \sor"rel\, n.
   a yellowish or redish brown color.
   1913 webster

[3] : The Collaborative International Dictionary of English v.0.48

sorrel \sor"rel\, n. f. surelle, fr. sur sour, fr. ohg. s?r
   sour. see sour. bot.
   one of various plants having a sour juice; especially, a
   plant of the genus rumex, as rumex acetosa, rumex
   acetosella, etc.
   1913 webster

   mountain sorrel. bot. see under mountain.

   red sorrel. bot.
   a a malvaceous plant hibiscus sabdariffa whose acid
       calyxes and capsules are used in the west indies for
       making tarts and acid drinks.
   b a troublesome weed rumex acetosella, also called
       sheep sorrel.

   salt of sorrel chem., binoxalate of potassa; -- so called
      because obtained from the juice of rumex acetosella, or
      rumex axetosa.

   sorrel tree bot., a small ericaceous tree oxydendrum
      arboreum whose leaves resemble those of the peach and
      have a sour taste. it is common along the alleghanies.
      called also sourwood.

   wood sorrel bot., any plant of the genus oxalis.
      1913 webster
see also:
sour rumex rumex acetosa rumex acetosella mountain sorrel mountain 
red sorrel hibiscus sabdariffa rumex acetosella sheep sorrel salt of sorrel 
rumex axetosa sorrel tree oxydendrum arboreum sourwood wood sorrel 

[4] : WordNet (r) 2.0

sorrel
     adj : of a light brownish color syn: brownish-orange
     n 1: any plant or flower of the genus oxalis syn: oxalis, wood
          sorrel
     2: any of certain coarse weedy plants with long taproots,
        sometimes used as table greens or in folk medicine syn: dock,
         sour grass
     3: east indian sparsely prickly annual herb or perennial
        subshrub widely cultivated for its fleshy calyxes used in
        tarts and jelly and for its bast fiber syn: roselle, rozelle,
         red sorrel, jamaica sorrel, hibiscus sabdariffa
     4: large sour-tasting arrowhead-shaped leaves used in salads
        and sauces syn: common sorrel
     5: a horse of a brownish orange to light brown color
see also:
brownish-orange oxalis wood sorrel dock sour grass roselle 
rozelle red sorrel jamaica sorrel hibiscus sabdariffa common sorrel 

[5] : Moby Thesaurus II by Grady Ward, 1.0

54 moby thesaurus words for "sorrel":
   bay, bayard, beige, brown, brownish, brownish-yellow, brunet,
   buckskin, calico pony, chestnut, chocolate, cinnamon, cocoa,
   cocoa-brown, coffee, coffee-brown, dapple-gray, drab, dun,
   dun-brown, dun-drab, ecru, fawn, fawn-colored, fuscous, gray,
   grege, grizzle, hazel, khaki, lurid, nut-brown, olive-brown,
   olive-drab, paint, painted pony, piebald, pinto, roan, seal,
   seal-brown, sepia, skewbald, snuff-colored, tan, taupe, tawny,
   toast, toast-brown, umber, umber-colored, walnut, walnut-brown,
   yellowish-brown

Sorrel >> S Words
Sorrel, definition of term: Sorrel
sorrel_pag1.html

Wood Sorrel >> W Words
Wood Sorrel, definition of term: Wood Sorrel
wood+sorrel_pag1.html

Sheep Sorrel >> S Words
Sheep Sorrel, definition of term: Sheep Sorrel
sheep+sorrel_pag1.html