\O"vo*lo\, n. [It. ovolo, uovolo, fr. L. ovum an egg. Cf.
{Ovule}.] (Arch.)
A round, convex molding. See Illust. of {Column}.
Note: In Roman work it is usually a quarter circle in
      section; in Greek work it is flatter, and is equivalent
      to the echinus; that is, it has in section the elastic
      curve of the shell of the sea urchin. In medi[ae]val
      architecture it is not distinguishable from the
      multitude of convex moldings, of all sections, which
      are used.