Definition of mho in US English:



  • The reciprocal of an ohm, a former unit of electrical conductance.

    • ‘I searched the site and could not find the conversion between reciprocal ohms or mhos and siemens.’
    • ‘An older name for the siemens is the mho, which, of course, is ohm spelled backwards (which was written as an inverted Greek omega).’
    • ‘Skin conductance is usually measured in ‘Siemens’ units although sometimes ‘mho’ is used.’
    • ‘According to the current national standard in the United States, the mho is not to be used.’
    • ‘The maximal resolution of the system was .0488 [micro] mho.’


Late 19th century: the word ohm reversed.