A male person who suffers from one or more allergies and reacts hypersensitively to certain substances (allergens).
example
Als Allergiker muss ich im Frühling Medikamente gegen Heuschnupfen nehmen.
As an allergy sufferer, I have to take medication for hay fever in spring.
Usage tips
Word structure
The word is derived from 'die Allergie' (allergy). The ending '-iker' often refers to a person who is characterized by something or has to do with it professionally; here, it means a person with an allergy.
EXAMPLE
Als Techniker kennt er sich gut mit Computern aus.
As a technician, he knows a lot about computers.
Sentence structure and usage
To name the specific allergy, German uses the preposition 'gegen' followed by the accusative. So someone is 'Allergiker gegen' (allergic to / an allergy sufferer with respect to) something.
EXAMPLE
Mein Bruder ist starker Allergiker gegen Katzenhaare.
My brother is severely allergic to cat hair.
Typical usage
The phrase 'für Allergiker geeignet' (suitable for allergy sufferers) is very common on food packaging or on menus to point out safe products.
EXAMPLE
Dieses Waschmittel ist speziell für Allergiker geeignet.
This laundry detergent is specially suitable for allergy sufferers.