Search Result for "voltmeter": 
Wordnet 3.0

NOUN (1)

1. meter that measures the potential difference between two points; 



The Collaborative International Dictionary of English v.0.48:

Voltmeter \Volt"me`ter\, n. [2d volt + -meter.] (elec.)
   An instrument for measuring in volts the differences of
   potential between different points of an electrical circuit.
   [1913 Webster]


WordNet (r) 3.0 (2006):

voltmeter
    n 1: meter that measures the potential difference between two
         points