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halo-

1.
a combining form meaning “salt,” used in the formation of compound words (halophyte); sometimes specialized as a combining form of halogen (halothane).
Also, especially before a vowel, hal-.
Origin
< Greek, combining form of háls salt
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for halo-

halo-

combining form
1.
indicating salt or the sea: halophyte
2.
relating to or containing a halogen: halothane
Word Origin
from Greek hals,hal- sea, salt
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 halo-

before vowels hal-, word-forming element meaning "salt, sea," from Greek hals (genitive halos) "a lump of salt, salt generally," in Homer, "the sea," from PIE *sal- "salt" (see salt (n.)).

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

halo- or hal-
pref.

  1. Salt: halophilic.

  2. Halogen: halide.

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