SAN'GUIN, adjective [Latin sanguineus, from sanguis, blood.] 1. Red; having the color of blood; as a sanguine color or countenance. 2. Abounding with blood; plethoric; as a sanguine habit of body. 3. Warm; ardent; as a sanguine temper. 4. Confident. He is sanguine in his expectations of success. SAN'GUINE, noun Blood color. [Not in use.] SAN'GUINE, verb transitive 1. To stain with blood. [But ensanguine is generally used.] 2. To stain or varnish with a blood color.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI