The Collaborative International Dictionary of English v.0.48:

Boultel \Boul"tel\, Boultin \Boul"tin\, n. (Arch.)
   (a) 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.
   (b) One of the shafts of a clustered column. [Written also
       bowtel, boltel, boultell, etc.]
       [1913 Webster]