<p><strong>Adjective</strong></p><ul><li>Of, relating to, or exhibiting heterosexuality; sexual desire or behavior directed toward people of the other binary gender.</li><li>Biology: Of or relating to different sexes, such as heterosexual fraternal twins.</li></ul><p><strong>Noun</strong></p><ul><li>A person who is sexually or romantically attracted primarily to people of the other binary gender.</li></ul>