tardyon

"We've said you can't accelerate a tardyon faster than light, correct?

A bradyon, also known as a tardyon or ittyon, is a particle that travels slower than light.

Everything around us is, by contrast, a tardyon: it is inhibited by the velocity of light.

"I said you can't move a tardyon faster than light, but that rule applies only if you keep the tardyon in its original state of matter.

Her ignorance was indicated by the fact that, when she finally learned what her invention did, she referred to the effect as 'going into tach' and 'resuming tard', as though tachyon/tardyon principles were some- how involved.