tab tab /ˈtæb/

noun

1. A dose of medicine in the form of a small pellet  ( lozenge , tab , tablet , pill )
   a dose of medicine in the form of a small pellet
    The pill was a small blue tablet to be taken with water
   The pill was a small blue tablet to be taken with water
   
   
2. A short strip of material attached to or projecting from something in order to facilitate opening or identifying or handling it  ( tab )
   a short strip of material attached to or projecting from something in order to facilitate opening or identifying or handling it
    Pull the tab to open the can
   pull the tab to open the can
    Files with a red tab will be stored separately
   files with a red tab will be stored separately
    The collar has a tab with a button hole
   the collar has a tab with a button hole
    The filing cards were organized by cards having indexed tabs
   the filing cards were organized by cards having indexed tabs
   
   
3. The key on a typewriter or a word processor that causes a tabulation  ( tab , tab key )
   the key on a typewriter or a word processor that causes a tabulation
   
   
4. Sensationalist journalism  ( tab , tabloid , yellow journalism )
   sensationalist journalism
   
   
5. [Informal, N. American] The bill in a restaurant  ( chit , tab [Informal, N. American] , check [ N. American] )
   the bill in a restaurant
    He asked the waiter for the check
   he asked the waiter for the check