am·pli·fi·er 
(ămplə-fī′ər)
(ămplə-fī′ər)n.
1. One that amplifies, enlarges, or extends.
2.
a. An electronic device that is used to increase the magnitude of an electrical signal.
b. A device that is used to increase the magnitude of an information-carrying signal.
- orthogonal projection
- orthograde
- orthographer
- orthographic
- orthographical
- orthographically
- orthographist
- orthography
- ortholog
- orthologous
- orthologue
- orthomolecular
- orthomyxovirus
- orthopaedics
- orthopedic
- orthopedically
- orthopedics
- orthopedist
- orthopsychiatric
- orthopsychiatrical
- orthopsychiatrist
- orthopsychiatry
- orthopteran
- orthopterous
- orthopyroxene