1. The act or an instance of intentionally killing oneself.
2. The destruction or ruin of one's own interests: It is professional suicide to involve oneself in illegal practices.
3. One who dies by suicide.
intr.v. su·i·cid·ed, su·i·cid·ing, su·i·cides
To kill oneself; die by suicide.
Relating to, involving, or resulting in one's voluntary death.
[Latin suī, of oneself; see s(w)e- in the Appendix of Indo-European roots + –CIDE.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 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.