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Pfund series

American

[fuhnd, pfoond] / fʌnd, pfʊnd /

noun

Spectroscopy.

a series of lines in the infrared spectrum of hydrogen.

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.