1. One who gives testimony or bears witness.

2. One who testifies.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• testfied,
• testifide,
• tesified,
• testifed,
• testifyed,
• testifes,
• tstified,
• testifaed,
• testifie,
• testifiy,
• testifing,
• testafied,
• tesitified,
• mistifier,
• festifier,
• gestifier,
• yestifier,
• 6estifier,
• 5estifier,
• testifiee

• test tube,
• testify,
• text file.

The adjective form of the word "testifier" is "testifying".

The plural of the "testifier" can be the "testifiers".

The singular of the "testifier" can be the "testifier".