Yours, Etc.: Origins and Uses of 8 Sign-Offs
1849, from Latin exsanguinatus "bloodless," past participle of exsanguinare, from ex- "out" (see ex-) + sanguinem (nominative sanguis) "blood" (see sanguinary). Related: Exsanguinated; exsanguinating; exsanguination. As an adjective, exsanguine "bloodless" is attested from mid-17c. in literal and figurative use.
exsanguinate ex·san·gui·nate (ěks-sāng'gwə-nāt')
v. ex·san·gui·nat·ed, ex·san·gui·nat·ing, ex·san·gui·nates
To deprive of or drain of blood.