1. A small glass adequate to hold a single swallow of whiskey
   "The bartender lined up a row of jiggers for the patrons";
   - shot glass, pony [informal]
    
2. Any small mast on a sailing vessel; especially the mizzenmast of a yawl
   "The captain ordered the crew to adjust the sails on the jigger";
   - jiggermast
    
3. Larval mite that sucks the blood of vertebrates including human beings causing intense irritation
   "Harvest mites, also known as jiggers, can cause severe itching in humans";
   - harvest mite, chigger, redbug

Derived forms: jiggers

Type of: drinking glass, glass, mast, trombiculid

Part of: genus Trombicula, Trombicula

Encyclopedia: Jigger, Louisiana