Definition of electron
: 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
Recent Examples of electron from the Web
This undated electron microscope image made available by the Centers for Disease Control and Prevention shows human immunodeficiency virus particles (virions).
But Juno also detected charged particles — mostly electrons — traveling in the opposite direction at Jupiter: out of the planet into space.
Pushing buttons nearby causes the megachip to execute its instructions, and the lights in the floor show the route electrons take to the various components necessary to complete a task.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'electron'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of electron
electr- + 2-on
First Known Use: 1891See Words from the same year
ELECTRON Defined for English Language Learners
Definition of electron for English Language Learners
physics : a very small particle of matter that has a negative charge of electricity and that travels around the nucleus of an atom
ELECTRON Defined for Kids
Definition of electron for Students
: a very small particle that has a negative charge of electricity and travels around the nucleus of an atom
Seen and Heard
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