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Definition of Half brother
1. Noun. A brother who has only one parent in common with you.
Definition of Half brother
1. Noun. A male sibling who has a different father, but the same mother. (Also known as ''maternal half brother'') ¹
2. Noun. A male sibling who has a different mother, but the same father. (Also known as ''paternal half brother'') ¹
¹ Source: wiktionary.com