The Collaborative International Dictionary of English v.0.48:

Hoover \Hoover\ n. [a trademark.]
   a kind of vacuum cleaner.
   [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

hoover \hoover\ v. t.
   to clean with a vacuum cleaner. [slang]

   Syn: vacuum, vacuum-clean.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Hoover
    n 1: United States industrialist who manufactured vacuum
         cleaners (1849-1932) [syn: Hoover, William Hoover,
         William Henry Hoover]
    2: United States lawyer who was director of the FBI for 48 years
       (1895-1972) [syn: Hoover, J. Edgar Hoover, John Edgar
       Hoover]
    3: 31st President of the United States; in 1929 the stock market
       crashed and the economy collapsed and Hoover was defeated for
       reelection by Franklin Roosevelt (1874-1964) [syn: Hoover,
       Herbert Hoover, Herbert Clark Hoover, President Hoover]
    4: a kind of vacuum cleaner
    v 1: clean with a vacuum cleaner; "vacuum the carpets" [syn:
         vacuum, vacuum-clean, hoover]