the.com/moustache

means The strip of hair grown or groomed above the upper lip, distinct from a full beard.

from Comes from French moustache, borrowed from Italian mostaccio, tracing back to Greek mystax (upper lip, or the hair on it) — a word some link to myllon, 'to close the lips,' though that connection stays speculative. The Greek term spread through the Mediterranean and eventually anglicized into the mustache/moustache spelling split we still argue about today.