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OVOLO
A round, convex molding.
In Roman work it is generally a quartercircle in section; in Greek work it is flatter, and is equivalent to the echinus; that is, it has in section the elasticcurve of the shell of the sea urchin. In mediaeval architecture it is not distinguishable from the multitude of convex moldings, of all sections, which are used.
Origin: It. Ovolo, uovolo, fr. L. Ovum an egg. Cf. Ovule.
Source: Websters Vocabulary