other, another, different
: also, before a vowel, heter-
Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by
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Word origin of 'hetero-'Gr hetero-, other, different < heteros, the other (of two), earlier hateros < IE *sm-tero- < base *sem-, *sm-, one, together > L semper, simplus + *-tero-, expressing contrast, comparison