Definition of brotherkin in English:

brotherkin

noun

depreciative
  • A small brother. Sometimes as a title or an affectionate form of address. Occasionally depreciative.

Origin

Early 19th century; earliest use found in Thomas Carlyle (1795–1881), author, biographer, and historian. From brother + -kin, originally after German Brüderchen (Old High German bruoderkin, in a 13th-century manuscript of a glossary).

Pronunciation

brotherkin

/ˈbrʌðəkɪn/