allergic

If you're allergic, your body has an exaggerated response to some substance, like cat dander or pollen, that makes you sneeze or get itchy. Many people are allergic to dust.

If you have an allergy to something, your immune system goes crazy when you come in contact with it: if this happens to you, you're allergic. You might be allergic to certain plants, and spend the spring with itchy eyes, for example, or sneeze every time you pet your best friend's dog. Allergic comes from allergy, from the German Allergie, which is rooted in the Greek word allos, "other, different, or strange."

Definitions of allergic
  1. adjective
    characterized by or caused by allergy
    “an allergic reaction”
  2. adjective
    having an allergy or peculiar or excessive susceptibility (especially to a specific factor)
    allergic children”
    synonyms: hypersensitised, hypersensitive, hypersensitized, sensitised, sensitized, supersensitised, supersensitive, supersensitized
    susceptible
    (often followed by `of' or `to') yielding readily to or capable of
Word Family
EDITOR’S CHOICE

Test prep from the experts

Boost your test score with programs developed by Vocabulary.com’s experts.

  • Proven methods: Learn faster, remember longer with our scientific approach.
  • Personalized plan: We customize your experience to maximize your learning.
  • Strategic studying: Focus on the words that are most crucial for success.

SAT/PSAT

$29.95
  • Number of words: 500+
  • Duration: 8 weeks or less
  • Time: 1 hour / week

TOEFL

$29.95
  • Number of words: 500+
  • Duration: 10 weeks or less
  • Time: 1 hour / week

ACT

$29.95
  • Number of words: 700+
  • Duration: 10 weeks
  • Time: 1 hour / week