barrier
131barrier layer — noun : the surface of contact between a semiconductor (as cuprous oxide) and a metal (as copper) that acts as an alternating current rectifier or photovoltaic cell when included in a circuit * * * barrier layer (electronics) see ↑depletion layer… …
132barrier beach — noun see barrier I, 2b * * * a sand ridge that rises slightly above the surface of the sea and runs roughly parallel to the shore, from which it is separated by a lagoon. * * * barrier beach, a long, thin sand ridge built by the action of waves… …
