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Dictionary

pho•to•tube

Pronunciation: (fō'tu-tOOb", -tyOOb"), [key]
—n. Electronics.
an electron tube with a photosensitive cathode, used like a photocell. Also called photoelectric tube.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

phototropism

phototype

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