Source : Webster's Revised Unabridged Dictionary (1913)

Umbraculiform \Um*brac`u*li*form\, a. [L. umbraculum any thing
   that furnishes shade, a bower, umbrella (dim. of umbra a
   shade) + -form.]
   Having the form of anything that serves to shade, as a tree
   top, an umbrella, and the like; specifically (Bot.), having
   the form of an umbrella; umbrella-shaped.