n.1.  A woman whose spouse has died and who has not remarried.
2.  Informal   A woman whose spouse is often away pursuing a sport or hobby.
3.  An additional hand of cards dealt face down in some card games, to be used by the highest bidder. Also called  kitty1.
4.  Printing  a.  A single, usually short line of type, as one ending a paragraph, carried over to the top of the next page or column.
b.  A short line of type at the bottom of a page, column, or paragraph.