Etymology
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sanguinary (adj.)

1620s, "characterized by slaughter, attended by much bloodshed;" also bloodthirsty, eager to shed blood, delighting in carnage," from French sanguinaire or directly from Latin sanguinarius "of or pertaining to blood," also, rarely, "blood-thirsty," from sanguis (genitive sanguinis) "blood," a word of unknown origin. Latin distinguished sanguis, the generic word, from cruor "blood from a wound" (related to English raw, from PIE root *kreue-). The classical sense of "pertaining to blood" is rare in English.

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Definitions of sanguinary

sanguinary (adj.)
accompanied by bloodshed;
this bitter and sanguinary war
Synonyms: gory / sanguineous / slaughterous / butcherly
sanguinary (adj.)
marked by eagerness to resort to violence and bloodshed; "went after the collaborators with a sanguinary fury that drenched the land with blood"-G.W.Johnson;
Synonyms: bloodthirsty / bloody-minded
From wordnet.princeton.edu