Answer: entasis

AnswerCrossword Clue
ENTASISSlight curve in the shaft of a column.
ENTASISOutward curve of the shaft of a column.
ENTASISConvexity in the shaft of a column
ENTASISArchitectural curve
ENTASISColumn-shaft swelling
entasisa slight convexity in a column
entasisslight convexity given to a column or tower, as to correct an optical illusion