Definition of ostracizer in US English:

ostracizer

(also ostraciser)

noun

rare
  • A person who or thing which ostracizes, or causes ostracism.

Origin

Late 19th century; earliest use found in Thomas Hardy (1840–1928), novelist and poet. From ostracize + -er.

Pronunciation

ostracizer

/ˈɒstrəsʌɪzə/