Etymology
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hemophobia (n.)
1844, from hemo- "blood" + -phobia "fear." Perhaps based on French hémophobie. Originally in reference to fear of medical blood-letting.
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Rh factor 
1942, from the first letters of rhesus; so called because the blood group, and its effects, were discovered in the blood of rhesus monkeys (1941).
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toxemia (n.)
"blood-poisoning," also toxaemia, 1848, from toxo- (before vowels tox-, from Greek toxon; see toxic) + -emia (from Greek haima "blood").
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bloodhound (n.)
also blood-hound, type of large dog used in hunting, c. 1300, from blood (n.) + hound (n.). It traces wounded prey by the scent of the blood it has spilled, or any other trace. Similar formation in Dutch bloedhond, German Bluthund.
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*kreue- 

*kreuə-, Proto-Indo-European root meaning "raw flesh."

It forms all or part of: 

creatine; creosote; crude; cruel; ecru; pancreas; raw; recrudesce; recrudescence.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit kravis- "raw flesh," krura- "raw, bloody;" Greek kreas "flesh;" Latin crudus "bloody, raw; cruel," cruor "thick blood;" Old Irish cru "gore, blood," Middle Irish cruaid "hardy, harsh, stern;" Old Church Slavonic kry "blood;" Old Prussian krawian, Lithuanian kraūjas "blood;" Old English hreaw "raw," hrot "thick fluid, serum."

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bleed (v.)
Old English bledan, "to cause to lose blood, to let blood" (in Middle English and after, especially "to let blood from surgically"), also (intrans.) "to emit blood," from Proto-Germanic *blodjan "emit blood" (source also of Old Norse blæða, Dutch bloeden, German bluten), from PIE *bhlo-to- "swell, gush, spurt," or "that which bursts out," from suffixed form of root *bhel- (3) "to thrive, bloom."

Meaning "extort money from" is from 1670s. Of dyes or paints, "to be washed out," from 1862. Figuratively, of the heart, "to suffer anguish, feel pity or sorrow," late 14c.
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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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spray (n.1)
"small branch," mid-13c., of uncertain origin. Perhaps related to Old English spræc "shoot, twig" (see sprig), and compare Danish sprag in same sense.
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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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