femtomachineEtymologyFrom femto- + machine, by analogy with micromachine, nanomachine, and so on.femtomachine means A (hypothetical or fictional) machine on the femto scale; that is, a mechanical device whose size is on the order of the femtometer. Lexicurio rates it Rare gem — a strength score of 82 out of 100.nounA (hypothetical or fictional) machine on the femto scale; that is, a mechanical device whose size is on the order of the femtometer.“Femtomachines built from exotic nuclei had been employed as special-purpose computers ever since the basic design had been developed, six thousand years before.”