The Collaborative International Dictionary of English v.0.48:

Strombuliform \Strom*bu"li*form\, a. [NL. strombulus, dim. of
   strombus + -form. See Strombus.]
   1. (Geol.) Formed or shaped like a top.
      [1913 Webster]

   2. (Bot.) Coiled into the shape of a screw or a helix.
      [1913 Webster]