'Quarter round' definitions:

Definition of 'quarter round'

(from WordNet)
noun
A convex molding having a cross section in the form of a quarter of a circle or of an ellipse [syn: ovolo, thumb, quarter round]

Definition of 'Quarter round'

From: GCIDE
  • Quarter round \Quar"ter round`\ (Arch.) An ovolo. [1913 Webster]