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ammonio-

  1. a combining form representing ammonia or ammonium in compound words: ammonioferric.
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Also especially before a vowel, ammoni-.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

ammonio- in Medicine

ammonio-

pref.
  1. Containing an ammonium group:ammoniocupric sulfate.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.