Webster's English Dictionary

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sanguine

1. san.guine \'san-gw*n\ \-gw*n-n*s\ aj [ME sanguin, fr. MF, fr. L 
   sanguineus, fr. sanguin-, sangu]is 1: BLOODRED  2a: consisting of or 
   relating to blood  2b: SANGUINARY  of the complexion  2c: RUDDY  3a: having 
   blood as the predominating bodily humor  3b: having the bodily conformation 
   and temperament held characteristic of  such predominance and marked by 
   sturdiness, high color, and cheerfulness 4: CONFIDENT, OPTIMISTIC  - 
   san.guine.ly av
2. sanguine n : a moderate to strong red