Other forms: half-brothers
A half-brother is a brother who shares only one of your parents. My half-brother.
It is a statement about parentage rather than about the relationship. A half-brother raised in the same house is a brother in every way that matters.
1nounhalf-brotherA brother who shares only one of your parents.
“He met his half-brother for the first time at forty.”
half-brother is a relative.
Half plus brother, describing the shared half of the parentage.
Middle English
half
English
half
English, today
half-brother
Equivalent to half + brother. half comes from Middle English half. From Middle English half, halfe from Old English healf (“half”); as a noun, 'half', 'side', 'part', from Proto-West Germanic halb, from Proto-Germanic halbaz. 2
Etymology from Wiktionary, CC BY-SA