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-ergic as in sentences like Y is Xergic denotes that Y has the property of being sensitive to X or that Y produces X. In simple terms, it means that the noun does something with x. In my field of study, this os true for e.g. dopaminergic-, serotonergic-, and glutamatergic neurons which are neurons that are sensitive to these respective neurotransmitters and/or releases them.

But the word allergic seems to denote only a sensitivity to allergens but not a production of allergens? An allergic person does not release pollen. Is the word allergic too general and therefore a misnomer?

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    The word allergic was first by around 20 years (1911). If anybody is misusing the suffix, it's your field of study, which adapted the -ergic suffix in 1934. [From the OED: H.H. Dale – We seem to need words which will briefly indicate action by two kinds of chemical transmission, due in the one case to some substance like adrenaline, in the other case to a substance like acetylcholine, so that we may distinguish between chemical function and anatomical origin. I suggest the words ‘adrenergic’ and ‘cholinergic’ respectively.] – Peter Shor May 24 '16 at 12:51
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The etymology of the term is different from what you are suggesting, I don't think it is a misnomer:

Allergic (adj.) :

  • 1911, from allergy + -ic; perhaps modeled on French allergique (1906).

allergy (n.) :

  • 1911, from German Allergie, coined 1906 by Austrian pediatrician Clemens E. von Pirquet (1874-1929) from Greek allos "other, different, strange" (see alias (adv.)) + ergon "activity" (see organ).

Dopaminergic:

  • Containing, involving, or transmitting dopamine.

Etymology:

-ergic

  • produced by the specified thing
  • activated by the specified thing
  • The etymology is not that different. The suffix -ergic comes from the Greek suffix -ergos + the English/French/Latin suffix -ic. These are the same components that form allergic (since -ergos is the suffix corresponding to the Greek word ergon. – Peter Shor May 24 '16 at 12:55

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