Here are the possible solutions for amplifiers for short clue
Answer
Clue
Relevancy
pas
Clue
Amplifiers, for short
Definition
(French) a step
lasers
Clue
Amplifiers of electromagnetic waves
Definition
LASER, a source of high-intensity optical, infrared, or ultraviolet radiation produced as a result of stimulated emission maintained within a solid, liquid, or gaseous medium
masers
Clue
Electromagnetic wave amplifiers
Definition
MASER, a device used to amplify long-range radar and radio astronomy signals