different between femto vs femtomachine

English

From femto- +? machine, by analogy with micromachine, nanomachine, and so on.

femtomachine (plural femtomachines)

(very rare) A (hypothetical or fictional) machine on the femto scale; that is, a mechanical device whose size is on the order of the femtometer.
- 2002, Greg Egan, Schild's Ladder, HarperCollins (2004), ?ISBN, page 21:
  Femtomachines built from exotic nuclei had been employed as special-purpose computers ever since the basic design had been developed, six thousand years before.

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