1. A square clerical cap.

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

• beretta,
• gretta,
• barett,
• bernetta,
• bretha,
• berett,
• barette,
• maretta,
• berretta,
• britta,
• bretty,
• birista,
• airetta,
• bimettal,
• binett,
• biotta,
• birretta,
• bretta,
• bireta,
• byretta

• Birt,
• beret,
• Brett,
• Barett.

The adjective form of the word "biretta" is "biretted".

The plural of the "biretta" can be the "birettas".

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