n. (Elec.) A substance used to prevent polarization, as upon the negative plate of a voltaic battery. [ 1913 Webster ]

n. (Physics) That which polarizes; especially, the part of a polariscope which receives and polarizes the light. It is usually a reflecting plate, or a plate of some crystal, as tourmaline, or a doubly refracting crystal. [ 1913 Webster ]

[ 1913 Webster ]