Another reaction to a very severe stressor is called post traumatic stress disorder.

He felt that some reaction was called for, but he honestly didn't know what.

This reaction is called a homologation because the product has exactly one additional carbon more than the starting material.

This normal physiological reaction to invasion by foreign organisms is called inflammation.

The body's reaction to infection is called a disease.

A severe systemic reaction is called anaphylaxis and requires immediate medical treatment.

For this reason the reaction is also called a benzoin addition.

One's reaction to the "Book for Quartet" could not be called love.

Some reaction to this negative situation is called for.

A reaction between an acid and base is called neutralization.