Webster's English Dictionary

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capacitor

ca.pac.i.tor \-'pas-*t-*r\ n : a device giving capacitance usu. consisting 
   of conducting plate or foils  separated by thin layers of dielectric with 
   the plates on opposite sides of the dielectric layers oppositely charged by 
   a source of voltage and the electrical energy of the charged system stored 
   in the polarized dielectric