Um‐brac′u‐li‐form (ŭm‐brăk″ū̍‐lĭ‐fôrm), 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.