Etymology
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sanguineous (adj.)

1510s, "of the color of blood, of a deep red color;" 1640s, "of or pertaining to blood," from Latin sanguineus "of blood, bloody," from sanguin-, stem of sanguis (see sanguinary).

updated on December 10, 2021

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Definitions of sanguineous from WordNet

sanguineous (adj.)
accompanied by bloodshed;
Synonyms: gory / sanguinary / slaughterous / butcherly
sanguineous (adj.)
confidently optimistic and cheerful;
Synonyms: sanguine
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.