scram (skrăm) Slang
intr.v. scrammed, scram·ming, scrams
1. To leave a scene at once; go abruptly.
2. To shut down automatically. Used of a nuclear reactor.
A rapid shutting down of a nuclear reactor, especially in an emergency.
[Perhaps short for SCRAMBLE.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.