Webster's Revised Unabridged Dictionary · 1913

Sanguine

Sanguine , adjective

[French sanguin, Latin sanguineus, from sanguis blood. Compare 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; cheerfully optimistic; not desponding; confident; full of hope; as, sanguine of success; a sanguine disposition.

Sanguine , noun

1.
Blood color; red. — Spenser
2.
Anything of a blood-red color, as cloth. [Obsolete]
In sanguine and in pes he clad was all. — Chaucer
3.
(Mineralogy) Bloodstone.
4.
Red crayon. See the Note under Crayon, 1.

Sanguine , transitive verb

To stain with blood; to impart the color of blood to; to ensanguine.