au·tom·a·ton
(ô-tŏm′ə-tŏn′, -tən)n. pl. au·tom·a·tons or
au·tom·a·ta (-tə) 1. A self-operating machine or mechanism, especially a robot.
2. One that behaves or responds in a mechanical way.
[Latin, self-operating machine, from Greek, from neuter of automatos, self-acting; see automatic.]
au·tom′a·tous adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.