Po"lar*i`zer (?), 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.
<-- Polaroid. [A trademark of the Polaroid company] 1. polarizing light; as, a polaroid lens. Used to refer to a smitransparent material which permits transmission of only plane-polarized light. 2. Relating to, or able to take, instant photographs; as, a polaroid camera; a polaroid photo. -->
© Webster 1913.