1. Long hair on the upperlip.

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

• mistache,
• mataches,
• moustashes,
• mistackes,
• mastache,
• mostaches,
• mustach,
• mustace,
• mustashes,
• mustakes,
• mustacks,
• mostachs,
• mastackes,
• mustashe,
• staches,
• mistaces,
• mustashed,
• mustachs,
• mustasches,
• musaches

The adjective form of the word "mustaches" is "mustachioed".

The plural form of the word "mustache" is "mustaches".

The singular form of the word "Mustaches" is "Mustache"