Meaning of solid-state

sol•id-state

Pronunciation: (sol'id stāt'), [key]
— adj. Electronics.
  1. designating or pertaining to electronic devices, as transistors or crystals, that can control current without the use of moving parts, heated filaments, or vacuum gaps.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.