Every so often we hear the term "veil," as in the afterlife. Just last week, a reading at Mass from 2 Corinthians 3 reminded us that "whenever a person turns to the Lord, the veil is taken away."
Sometimes the word is used to describe spiritual blindness, as in Moses' time. No question: when it covers our eyes, it means hardness of mind and heart. That hardness, formed by sin, clouds spiritual vision.
The term is used most frequently, however, to describe the partition between earth and eternity.
For a veil it is: the barrier between here and there, thin, sometimes transparent, on occasion "poked through" in the way of apparitions or miracles or some form of communication.
Read more here: http://www.spiritdaily.com/veil.htm