control rod

noun

Definition of control rod

  1. :  a rod of a neutron-absorbing material (such as boron carbide) used to regulate the rate of nuclear fission in a reactor

Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Seen and Heard

What made you want to look up control rod? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to help become familiar with something

Get Word of the Day daily email!