1. Long hair on the upperlip.

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

• mistache,
• mustash,
• mostache,
• moustached,
• mastache,
• mustach,
• mustake,
• mustace,
• mustashes,
• moustashe,
• mustasche,
• moustach,
• mostachs,
• mostach,
• mushtache,
• moushtache,
• mustahce,
• mistace,
• mustashe,
• mistach

• mustachioed,
• moustache,
• mustagh,
• mustachio,
• mustached.

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

The plural of the "mustache" can be the "mustaches".

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