glam·our also glam·or 
(glămər)
(glămər)n.
1. Exciting or mysterious attractiveness usually associated with striking physical beauty, luxury, or celebrity.
2. Archaic Magic cast by a spell; enchantment.
[Scots, magic spell, alteration of GRAMMAR (from the association of learning with magic).]
Usage Note: Many words, such as honor, vapor, and labor, are usually spelled with an -or ending in American English but with an -our ending in British English. The preferred spelling of glamour, however, is -our, making it an exception to the usual American practice. The adjective is more often spelled glamorous in both American and British usage.