From The Collaborative International Dictionary of English v.0.48:

Umbraculiform \Um*brac`u*li*form\
   ([u^]m*br[a^]k"[-u]*l[i^]*f[^o]rm), 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.
   [1913 Webster]
   [1913 Webster]
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