SG Heritage Dictionary

Boultin [Noun] Webster's Dictionary 1828

In architecture, a molding, the convexity of which is just one fourth of a circle, being a member just below the plinth in the Tuscan and Doric capital.

Boultin [Noun] Webster's Dictionary 1913

1. A molding, the convexity of which is one fourth of a circle, being a member just below the abacus in the Tuscan and Roman Doric capital; a torus; an ovolo.

2. One of the shafts of a clustered column.