half-caste adjective 1noun 1forms 1 adjective1 •(offensive) Of mixed racial descent.It was the racist, settler colonialism that created whiteness, that created blackness, half-caste, quarter-caste, octoroon, that saw mixed-race people as a third race. — 2021 noun1 •(offensive) A person of mixed racial descent.AO Neville, the Protector of Aborigines in Western Australia until the 1930s, railed against the risk of the creation of a ‘third race’ of half-castes. — 2021 formshalf-castes