noun Mal·a·chi \ˈma-lə-ˌkī\

Definition of Malachi

  1. 1 :  a prophetic book of canonical Jewish and Christian Scripture — see bible table

  2. 2 —used as the conventional name for the unidentified fifth century b.c. writer of the book of Malachi

Origin and Etymology of malachi

Hebrew Mal'ākhī

First Known Use: 14th century

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