tomentum

from WordNet (r) 3.0 (2006)

tomentum
    n 1: filamentous hairlike growth on a plant; "peach fuzz" [syn:
         {hair}, {fuzz}, {tomentum}]
    2: a network of tiny blood vessels between the cerebral surface
       of the pia mater and the cerebral cortex [syn: {tomentum},
       {tomentum cerebri}]

from The Collaborative International Dictionary of English v.0.48

Tomentum \To*men"tum\, n.; pl. {Tomenta}. [L. See {Tomentose}. ]
   (Bot.)
   The closely matted hair or downy nap covering the leaves or
   stems of some plants.
   [1913 Webster]

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