The Reference Desk/vitreous vs. vitrious time

Another spelling question. Mary's Story features yet another of many regeneration inhibitors: vitreous time. There is little explanation of what it is, let alone how it's spelled. Currently, this is only mentioned on the Regeneration page with the spelling vitrious, which is not in a dictionary. The word vitreous is but it is hard to say whether it is the one meant. If anyone has the script of Mary's Story, I'd appreciate it if they could tell the correct answer.

If the script is not available, should we assume the dictionary spelling was meant? Any thoughts?