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Dictionary

e•ta•lon

Pronunciation: (āt'l-on"), [key]
—n. Optics.
an interferometer consisting of two glass plates that reflect approximately half of each ray of light incident upon them and that are separated by a small, fixed distance: used to compare wavelengths and to study atomic spectra.

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

et al

eta meson

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