spandrel

noun

1. an approximately triangular surface area between two adjacent arches and the horizontal plane above them
   Terjemahkan ke Indonesia sumber: wordnet30
2. The irregular triangular space between the curve of an arch and the inclosing right angle; or the space between the outer moldings of two contiguous arches and a horizontal line above them, or another arch above and inclosing them.
   Terjemahkan ke Indonesia sumber: webster1913