Consisting of blood; formed of blood: as, a sanguinary stream.Bloody; attended with much bloodshed or carnage: as, a sanguinary encounter.Bloodthirsty; eager to shed blood; characterized by cruelty.Synonyms and Sanguinary, Bloody. Sanguinary refers to the shedding of blood, or pleasure in the shedding of blood;’ bloody refers to the presence or, by extension, the shedding of blood: as, a sanguinary battle; the sanguinary spirit of Jenghiz Khan; a bloody knife or battle.n. The yarrow or milfoil: probably so called from its fabled use in stanching blood.n. The bloodroot, Sanguinaria Canadensis.