Meaning of allergen in English:


Pronunciation /?al?d?(?)n/

See synonyms for allergen on

Translate allergen into Spanish


  • A substance that causes an allergic reaction.

    ‘Future exposure to the same allergens will cause the reaction to happen again.’
    • ‘The next time you're exposed to the allergen, your immune system launches an allergic reaction.’
    • ‘Wherever possible, the most effective way of treating allergies is to avoid all contact with the allergen causing the reaction.’
    • ‘Gradually your body learns to accept the allergen as the harmless substance it is.’
    • ‘Your allergic reaction happens when your body's immune system mistakes the allergen for a harmful invader.’
    • ‘Allergies are caused by the body's immune system reacting to allergens as if they were harmful.’
    • ‘Eliminate any known allergens such as certain foods, dust, or pet dander from your household.’
    • ‘During allergy seasons, the local news broadcasts usually tell you what allergens are in the air.’
    • ‘If allergens in the air are an asthma trigger, pollutants can make the lungs even more sensitive to them.’
    • ‘In such an enclosed environment, allergens from one food can spread to another.’
    • ‘Substances that are normally harmless could act as allergens and trigger a reaction in certain people.’
    • ‘Avoid things that could make symptoms worse, such as air pollution and allergens.’
    • ‘It is well known that vacuum cleaner bags capture large particles but can emit allergens that are too small to be collected in the bag.’
    • ‘Once a person is sensitized to an allergen or chemical, he or she may develop asthma.’
    • ‘First, allergic reactions are caused by allergens, the three most common ones being dust and mites, pollen and nuts.’
    • ‘The goal is to desensitize you to specific allergens and decrease your need for medications.’
    • ‘Whether your eczema is due to an irritant, such as detergent, or due to an allergen, such as nickel, care and treatment of your skin is the same.’
    • ‘If you take away the allergens that were driving it initially, the inflammation is likely to continue.’
    • ‘Your doctor may take tests to see what allergens are causing the hay fever symptoms.’
    • ‘The rash usually clears if the allergen is no longer in contact with the skin, but recurs with any slight contact with it again.’


Early 20th century blend of allergy and -gen.