Chemistry. of or relating to an atom other than carbon, particularly in a cyclic compound.
Informal. heterosexual.

noun, plural het·er·os.

Informal. a heterosexual person.

Origin of hetero

1930–35 for def 2; (in def 1) by shortening of heteroatom; (in def 2) by shortening of heterosexual; see -o
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British Dictionary definitions for heteros


noun, adjective plural -os

short for heterosexual
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