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phreno-

American  

  1. a combining form meaning “mind,” “diaphragm,” used in the formation of compound words.

    phrenology.
phreno- British  

combining form

  1. mind or brain

    phrenology

  2. of or relating to the diaphragm

    phrenic
"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

Etymology

Origin of phreno-

< Greek phreno-, combining form representing phrḗn mind, diaphragm

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.