Where two barrel vaults intersect, in architecture Crossword Clue

 The answer to the crossword clue "Where two barrel vaults intersect, in architecture" is GROIN. A groin vault is a type of vault that is formed by the intersection of two barrel vaults at right angles. The word "groin" refers to the edge between the intersecting vaults.

Here are some other words that could be used for the crossword clue "Where two barrel vaults intersect, in architecture":

Cross vault

Double barrel vault

Quadripartite vault

Intersecting vault

Pointed vault

I hope this helps! Let me know if you have any other questions.