Source : Webster's Revised Unabridged Dictionary (1913)

Sanguine \San"guine\, v. t.
   To stain with blood; to impart the color of blood to; to
   ensanguine.

Sanguine \San"guine\, a. [F. sanguin, L. sanguineus, fr. sanguis
   blood. Cf. {Sanguineous}.]
   1. Having the color of blood; red.

            Of his complexion he was sanguine.    --Chaucer.

            Like to that sanguine flower inscribed with woe.
                                                  --Milton.

   2. Characterized by abundance and active circulation of
      blood; as, a sanguine bodily temperament.

   3. Warm; ardent; as, a sanguine temper.

   4. Anticipating the best; not desponding; confident; full of
      hope; as, sanguine of success.

   Syn: Warm; ardent; lively; confident; hopeful.

Sanguine \San"guine\, n.
   1. Blood color; red. --Spenser.

   2. Anything of a blood-red color, as cloth. [Obs.]

            In sanguine and in pes he clad was all. --Chaucer.

   3. (Min.) Bloodstone.

   4. Red crayon. See the Note under {Crayon}, 1.

Source : WordNet®

sanguine
     adj 1: confidently optimistic and cheerful
     2: inclined to a healthy reddish color often associated with
        outdoor life; "a ruddy complexion"; "Santa's rubicund
        cheeks"; "a fresh and sanguine complexion" [syn: {rubicund},
         {ruddy}]