cascading menu

English Thesaurus

1. a secondary menu that appears while you are holding the cursor over an item on the primary menu (noun.communication)

hypernym	:	computer menu, menu,
definition	:	(computer science) a list of options available to a computer user (noun.communication)

domain category	:	computer science, computing,
definition	:	the branch of engineering science that studies (with the aid of computers) computable processes and structures (noun.cognition)