n.
Pronunciation: i- ' lek- ˌ trän
Function: noun
Etymology: electr- + 2 -on
Date: 1891
: an elementary particle consisting of a charge of negative electricity equal to about 1.602 × 10 -19 coulomb and having a mass when at rest of about 9.109 × 10 -31 kilogram or about 1/1836 that of a proton