1. A series of vertical bars of varying widths, in which each of the digits zero through nine are represented by a different pattern of bars that can be read by a laser scanner. The bars are commonly found on consumer products and are used especially for inventory control.

2. A DNA barcode.

1. bar·cod·ed, bar·cod·ing, bar·codes To provide or mark (an item) with a barcode.

2. To DNA barcode.