Definition of "napkin"

A serviette; a (usually rectangular) piece of cloth or paper used at the table for wiping the mouth and hands for cleanliness while eating.  examples

(Britain, South Africa) A nappy (UK), a diaper (American).  examples

A small scarf worn on the head by Christian women (chiefly Roman Catholic and Eastern Orthodox) when entering a church, as a token of modesty.  examples

Short for sanitary napkin.  examples