a test for a suspected allergy in which the skin is scratched and an allergen applied to the area, redness indicating a positive reaction.
(med) a skin test to determine allergic sensitivity to various substances by placing the allergen to be tested over an area of lightly scratched skin. A positive reaction is typically indicated by the formation of a weal
scratch test (skrāch)
A test for allergy performed by scratching the skin and applying an allergen to the wound.
- Scratch the surface
Investigate or treat something superficially, as in This feed-the-hungry program only scratches the surface of the problem, or Her survey course barely scratches the surface of economic history. This metaphoric term transfers shallow markings made in a stone or other material to a shallow treatment of a subject or issue. [ Early 1900s ]
- Scratch together
verb 1. (transitive, adverb) to assemble with difficulty: he scratched up a team for the football match
- Scratch up
- Scratch video
noun 1. the technique or practice of recycling images from films or television to make collages