drop-down menu

from WordNet (r) 3.0 (2006)

drop-down menu
    n 1: a menu of options that appears below the item when the
         computer user clicks on it

from The Free On-line Dictionary of Computing (8 July 2008)

pull-down menu
drop-down menu
pop-down menu

   <operating system> (Or "drop-down menu", "pop-down menu") A
   {menu} in a {graphical user interface}, whose title is
   normally visible but whose contents are revealed only when the
   user activates it, normally by pressing the {mouse} button
   while the {pointer} is over the title, whereupon the menu
   items appear below the title.  The user may then select an
   item from the menu or click elsewhere, in either case the menu
   contents are hidden again.  A menu item is selected either by
   dragging the mouse from the menu title to the item and
   releasing or by clicking the title and then the item.

   When a pull-down menu appears in the main area of a window, as
   opposed to the {menu bar}, it may have a small,
   downward-pointing triangle to the right.

   Compare: {scrollable list}.

   (1999-09-22)