Hypertext Webster Gateway: "perfoliate"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Perfoliate \Per*fo"li*ate\, a. [Pref. per- + L. folium leaf.]
1. (Bot.) Having the basal part produced around the stem; --
said of leaves which the stem apparently passes directory
through.
2. (Zo["o]l.) Surrounded by a circle of hairs, or projections
of any kind.
From WordNet (r) 1.7 (wn)
perfoliate
adj : of a leaf having the base united around (and apparently
pierced by) the stem
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