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 of halo-
< Greek, combining form of háls salt
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
hali- or before a vowel hal-
indicating salt or the seahalophyte
relating to or containing a halogenhalothane
Word Origin for halo-
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
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
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.