a person's brother by birth.
a male person bound to another by ties of great friendship.
something usually associated with or thought to exist inseparably from another thing, quality, circumstance, etc.: Humility is often the blood brother of patience.
a male established in a close relationship with another male through the performance of a specific ritual, as the commingling of blood.
- blood brotherhood, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use blood brother in a sentence
These studies, which use a peculiar surgical method called parabiosis that turns mice into literal blood brothers, show that aging is not inevitable.Has the fountain of youth been in our blood all along? | Kat McGowan | September 28, 2021 | Popular-Science
The blood intermingled a moment, then they rubbed noses and each repeated the word: "Blood-brother," three times.The Argus Pheasant | John Charles Beecham
And how I've given you the love of a blood-brother to take the place of the brother who died?Riders of the Silences | John Frederick
Slaughter of a member of the totem clan, of a blood-brother, must be atoned for because he is of the totem blood.The Myths of the North American Indians | Lewis Spence
Moussorgsky's style is blood-brother to the spoken language, is indeed as much the Russian language as music can be.Musical Portraits | Paul Rosenfeld
But many do desire it—kings of the West, kinsmen of the Marquess, above all the Melek's blood-brother.The Life and Death of Richard Yea-and-Nay | Maurice Hewlett
British Dictionary definitions for blood brother
a brother by birth
a man or boy who has sworn to treat another as his brother, often in a ceremony in which their blood is mingled
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012