the GNU version of the Collaborative International Dictionary of English
n. 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.
The Century Dictionary and Cyclopedia
n. In optics, that part of a polariscope by which light is polarized: distinguished from analyzer. Also spelled polariser.
Word Usage
"He's actually a polarizer, which is completely predictable and not his fault."