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a combining form meaning “shining,” “appearing, seeming,” used in the formation of compound words:
a combining form used in the names of chemical compounds that contain phenol or the phenyl group, are related to aromatic compounds, or derive from benzene:
Also, especially before a vowel, phen-.
Origin of pheno-
< New Latin phaeno- < Greek phaino- shining, combining form of phaínein to shine, appear; in chemical senses, used orig. with reference to products from the manufacture of illuminating gas Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for pheno-


combining form
showing or manifesting: phenotype
indicating that a molecule contains benzene rings: phenobarbital
Word Origin
from Greek phaino- shining, from phainein to show; its use in a chemical sense is exemplified in phenol, so called because originally prepared from illuminating gas
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for pheno-

before vowels phen-, word-forming element in science meaning "pertaining to or derived from benzene," from phene.

Online Etymology Dictionary, © 2010 Douglas Harper
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pheno- in Medicine

pheno- or phen-

  1. Showing; displaying: phenotype.

  2. Relating to or derived from benzene: phenol.

  3. Containing phenyl: phenothiazine.

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