Definitions of Mar:

• noun:   the month following February and preceding April
• noun:   a mark or flaw that spoils the appearance of something (especially on a person's body)
• verb:   make imperfect

  Example: "Nothing marred her beauty"

• verb:   destroy or injure severely
• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #14249)