The same as Thytas, a name of the female followers of Dionysus and named after Thyia, who is said to have been the first to have sacrificed to Dionysus, and to have celebrated orgies in his honour. Hence the Attic women, who every year went to Mount Parnassus to celebrate the Dionysiac orgies with the Delphian Thyiades, received themselves the name of Thyades or Thyiades.
"So when they saw Argo being rowed near the island,
straightway crowding in multitude from the gates of Myrine and
clad in their harness of war, they poured forth to the beach like
ravening Thyiades: for they deemed that the Thracians were come;
and with them Hypsipyle, daughter of Thoas, donned her father's
harness. And they streamed down speechless with dismay; such fear
was wafted about them." Argonautica (ll. 609-639)