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half brother

Today it means: A male sibling sharing a single parent, as distinguished from a full brother or brother-german, from a step-brother, or from a brother-like figure such as a blood brother. Full definition →

Middle English half broþer

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Middle English · inherited fromhalf broþer
English todayhalf brother

From Middle English half broþer, equivalent to half + brother. Cognate with Dutch halfbroer (“halfbrother”), German Halbbruder (“halfbrother”), Danish halvbroder (“halfbrother”), Swedish halvbroder, halvbror (“halfbrother”), Icelandic hálfbróðir (“halfbrother”).

Etymology from Wiktionary, CC BY-SA 4.0.