Definitions of groom:

• noun:   a man who has recently been married
• noun:   a man participant in his own marriage ceremony
• noun:   someone employed in a stable to take care of the horses
• verb:   care for one's external appearance

  Example: "He is always well-groomed"

• verb:   prepare (someone) for a future role or function

  Example: "He is grooming his son to become his successor"

• verb:   give a neat appearance to

  Example: "Groom the dogs"

• name:  A surname (rare: 1 in 50000 families; popularity rank in the U.S.: #5545)