Definition of idiasm in US English:

idiasm

noun

  • A peculiarity, especially a verbal one; a mannerism.

Origin

Mid 19th century; earliest use found in Clement Ingleby (1823–1886), literary scholar. From Byzantine Greek ἰδιασμός peculiarity from Hellenistic Greek ἰδιάζειν to be peculiar + -μός, suffix forming nouns.

Pronunciation

idiasm

/ˈɪdɪaz(ə)m/