a combining form representing phosphorus, in compound words: phosphoroscope.
Also, especially before a vowel, phosphor-.
Compare phospho-. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

phosphoro- or phosphor-

  1. Phosphorus: phosphorous acid.

  2. Phosphorescent: phosphorogen.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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