[1] : WordNet (r) 2.0

megahertz
     n : one million periods per second syn: mhz, megacycle per
         second, megacycle, mc
see also:
mhz megacycle per second megacycle mc 

[2] : The Free On-line Dictionary of Computing (27 SEP 03)

megahertz
     
        mhz millions of cycles per second.  the unit of frequency
        used to measure the clock rate of modern digital logic,
        including microprocessors.
     
        1994-10-27
     
     
see also:
clock rate microprocessor 

Megahertz >> M Words
Megahertz, definition of term: Megahertz
megahertz_pag1.html