The child of one's parent's half-sibling.

Alternative spelling of half sibling

plural of half-reaction

Occurring twice per month.

plural of half-caste

plural of half bath

son of one's half brother or half sister

(genetics) Having only one parent in common. / (genetics) Having parents of differing ethnicities. / (animals) Having only one parent from a known pedigree.

Alternative spelling of half niece

Alternative spelling of half nephew