gallium arsenide

noun Chemistry.
a crystalline and highly toxic semiconductor, GaAs, used in light-emitting diodes, lasers, and electronic devices.

Origin:
1960–65

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American Heritage
Science Dictionary
gallium arsenide  
A dark-gray crystalline compound used in transistors, solar cells, and semiconductor lasers. Chemical formula: GaAs.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The researchers layered two semiconducting materials, indium gallium arsenide
  and aluminum indium arsenide, into a single wafer.
The films contain gallium arsenide, a mixture of the elements gallium and
  arsenic that acts as a semiconductor in solar cells.
Previous experiments had managed the feat at ultra-cold temperatures, or by
  using exotic semiconductors such as gallium arsenide.
At best, you'll have an atomically thin programmable layer sitting on a bed of
  silicon or gallium arsenide.
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