gallium arsenide

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noun Chemistry.

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

Origin:
1960–65

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Gallium arsenide is always a great word to know.

So is elective. Does it mean:

a mixture composed of different substances or the same substance in different phases, such as solid ice and liquid water

selecting for combination or action; tending to combine with certain substances in preference to others, such as elective attraction

American Heritage

Science Dictionary

gallium arsenide
A dark-gray crystalline compound used in transistors, solar cells, and semiconductor lasers. Chemical formula: GaAs.

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