With Surfaces That Curve Inwards
This page is the CodyCross answer for the clue below from Architectural Styles, Group 1177, Puzzle 5 (Buckingham Palace).
Question is: With Surfaces That Curve Inwards
and the answer is: CONCAVE
Word Meaning:
CONCAVE — Curved like the inner surface of a sphere or bowl.
Definitions from Wiktionary.