• Webster's Revised Unabridged Dictionary
    • a Umbraculiform 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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Century Dictionary and Cyclopedia
    • umbraculiform Having the general form of an umbrella, as a mushroom. See cut under Agaricus.
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Chambers's Twentieth Century Dictionary
    • Umbraculiform having the general form of an umbrella, as a mushroom
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Webster's Revised Unabridged Dictionary
L. umbraculum, any thing that furnishes shade, a bower, umbrella (dim. of umbra, a shade) + -form,