Etymology
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bloodsucker (n.)
also blood-sucker, late 14c., of animals (leeches, mosquitoes, etc.), from blood (n.) + sucker (n.); in the figurative sense, of persons, it is attested from 1660s. Related: Bloodsucking.
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sanguicolous (adj.)

"living in the blood" (as a parasite does), by 1889, from Latin sanguis "blood" (see sanguinary) + colere "to inhabit" (see colony). Also, with classical stem, sanguinicolous.

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consanguine (adj.)

"descended from a common ancestor," c. 1600, from French consanguin (14c.), from Latin consanguineus "of the same blood," from assimilated form of com "with, together" (see con-) + sanguineus "of blood" (see sanguinary).

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sang-froid (n.)

also sangfroid, "presence of mind, coolness, mental composure," 1712, from French sang froid, literally "cool blood," from sang "blood" (from Latin sanguis; see sanguinary) + froid "cold" (from Latin frigidus; see frigid). "In the 17th c. the expression was in France often written erroneously sens froid, as if it contained sens "sense" instead of the homophonous sang "blood'." [OED].

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hemo- 
word-forming element meaning "blood," perhaps via Old French hemo-, Latin haemo-, from Greek haimo-, contraction of haimato-, combining form of haima "blood" (see -emia).
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gore (n.1)
"thick, clotted blood," Old English gor "dirt, dung, filth, shit," a Germanic word (cognates: Middle Dutch goor "filth, mud;" Old Norse gor "cud;" Old High German gor "animal dung"), of uncertain origin. Sense of "clotted blood" (especially shed in battle) developed by 1560s (gore-blood is from 1550s).
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ischemia (n.)
also ischaemia, 1866 (but as far back as 1660s in form ischaimes), from medical Latin ischaemia, from ischaemus "stopping blood," from Greek iskhaimos "stanching or stopping blood," from iskhein "to hold, curb, keep back, restrain" (from PIE *si-sgh-, reduplication of root *segh- "to hold" (from PIE root *segh- "to hold") + haima "blood" (see -emia). Related: Ischemic.
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leukocyte (n.)
also leucocyte, "white blood cell, white or colorless corpuscle of the blood or lymph," 1860, via French leucocyte, from leuco-, a Latinized combining form of Greek leukos "white, clear," from PIE root *leuk- "light, brightness" + -cyte "cell."
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tumult (n.)
late 14c., from Old French tumult (12c.), from Latin tumultus "commotion, bustle, uproar, disorder, disturbance," related to tumere "to be excited, swell" (from PIE root *teue- "to swell").
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