The term 'half-brother' is used in English to refer to a male sibling who shares one biological parent with you. In other words, a half-brother is a sibling with whom you share either the same father or the same mother, but not both. The prefix 'half-' is used to indicate the partial genetic relationship between the two individuals. It is a common and widely understood term in English-speaking countries to distinguish between full siblings who share both biological parents and half-siblings who share only one biological parent. In everyday conversation or written contexts, you can simply refer to someone as your 'half-brother' to convey this specific familial relationship.