Definitions of speck:

• noun:   a very small spot

  Example: "The plane was just a speck in the sky"

• noun:   (nontechnical usage) a tiny piece of anything
• noun:   a slight but appreciable addition
• verb:   produce specks in or on

  Example: "Speck the cloth"

• name:  A surname (rare: 1 in 50000 families; popularity rank in the U.S.: #6515)