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Allergy

/ˈælərdʒi/noun

An immune reaction to something that is harmless to most people.

The Greek roots

ἄλλος
állos
other, different
+
ἔργον
érgon
work, action

Literally: other working

The story of the word

Clemens von Pirquet, a Viennese paediatrician, coined Allergie in 1906 for any altered reactivity of the body, meaning it to cover protective immunity and damaging hypersensitivity alike, and he was irritated when usage narrowed it to the second. He built it on ἐνέργεια, energy, with ἄλλος swapped in: a changed working. The same ἄλλος gives allegory, speaking otherwise, and parallel.

How it travelled
Ancient Greek → German coinage → English
First recorded
1911

The same roots elsewhere

Other languages reached for exactly the same Greek pieces.

Same family

allegoryallopathyenergyergonomicsparallel

In a sentence

His allergy to walnuts was found the hard way at a birthday party.

The clinic tests for the six commonest allergies in one visit.

Built on the same root

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