Definition of "phototransistor" []

• A transistor having highly photosensitive electrical characteristics. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "To do this, we'll use an infrared emitter and phototransistor detector."
• "FODM8801 consists of an aluminum gallium arsenide AlGaAs infrared light emitting diode optically coupled to a phototransistor."
• "The presence of clear liquid causes the phototransistor to sink the maximum current, while the presence of dark liquid causes it to sink the minimum current."