Etymology
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allergic (adj.)
1911, from allergy (q.v.) + -ic; perhaps modeled on French allergique (1906). Figurative use, "antipathetic, repulsed" is from 1936.
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*werg- 
Proto-Indo-European root meaning "to do."

It forms all or part of: allergic; allergy; argon; boulevard; bulwark; cholinergic; demiurge; dramaturge; energy; erg (n.1) "unit of energy;" ergative; ergonomics; ergophobia; George; georgic; handiwork; irk; lethargic; lethargy; liturgy; metallurgy; organ; organelle; organic; organism; organize; orgy; surgeon; surgery; synergism; synergy; thaumaturge; work; wright; wrought; zymurgy.

It is the hypothetical source of/evidence for its existence is provided by: Greek ergon "work," orgia "religious performances;" Armenian gorc "work;" Avestan vareza "work, activity;" Gothic waurkjan, Old English wyrcan "to work," Old English weorc "deed, action, something done;" Old Norse yrka "work, take effect."
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anaphylaxis (n.)
"severe allergic reaction," 1905, from Latin anaphylaxis, perhaps based on French anaphylaxie (1902); see anaphylactic.
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ragweed (n.)

composite flowering plant of North America noted for the common allergic reaction to its pollen, 1790, from ragged + weed (n.); so called from shape of the leaves. The name had been applied to a different plant (ragwort) from 1650s.

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anaphylactic (adj.)

"of or pertaining to a severe allergic reaction," 1905, with -ic + medical Latin noun anaphylaxis "exaggerated susceptibility," from Greek ana- "up" (see ana-) + phylaxis "protection," from phylax "guardian, watcher, protector," a word of unknown origin. Compare prophylactic. Anaphylactic shock is attested by 1916.

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