from
The Free On-line Dictionary of Computing (8 July 2008)
pull-down list
drop-down list
<operating system> (Or "drop-down list") A {graphical user
interface} component that allows the user to choose one (or
sometimes more than one) item from a list. The current choice
is visible in a small rectangle and when the user clicks on
it, a list of items is revealed below it. The user can then
click on one of these to make it the current choice and the
list disappears. In some cases, by holding down a modifier
key such as Ctrl when clicking, the selection is added to (or
removed from) the set of current choices rather than replacing
it.
(1999-09-25)