au·tom·a·ton (ô-tŏmə-tŏn′, -tən)
n. pl. au·tom·a·tonsor au·tom·a·ta (-tə)
1. A machine or mechanism that operates without human intervention, especially a robot.
2. One who behaves or responds in a mechanical way.
[Latin, self-operating machine, from Greek, from neuter of automatos, self-acting; see AUTOMATIC.]
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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.