Having the ability to cause an allergic reaction; capable of triggering allergies in susceptible people.
Formed from allergen plus the adjectival suffix -ic, indicating a quality or characteristic of being allergen-producing or allergy-causing.
Scientists can now measure how 'allergenic' something is with lab tests—they've discovered that pollen from some plants is exponentially more allergenic than others, which is why some people suffer more during certain seasons!
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