Enter a clue or pattern or both:
The Clue
Scratch tests test for them (9 letter answer)
The Answer
ALLERGIES
Tags
Notes
The answer ALLERGIES is so rare that it appears less than once every 2500 puzzles.
Definition
ALLERGY as a noun:
1. (allergy, allergic reaction) = hypersensitivity reaction to a particular allergen; symptoms can vary greatly in intensity