(2 syl.) or Imam. One of the Ulema or priestly body of the Mahometans. He recites the prayers and leads the devotions of the congregation. Imaums wear a high turban. The sultan as “head of the Moslems” is an Imaum. The word means teacher or guide.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894