The Collaborative International Dictionary of English v.0.48:

Dendrite \Den"drite\, n. [Gr. dendri`ths, fem. dendri^tis, of a
   tree, fr. de`ndron a tree: cf. F. dendrite.] (Min.)
   A stone or mineral on or in which are branching figures
   resembling shrubs or trees, produced by a foreign mineral,
   usually an oxide of manganese, as in the moss agate; also, a
   crystallized mineral having an arborescent form, e. g., gold
   or silver; an arborization. Dendritic

WordNet (r) 3.0 (2006):

dendrite
    n 1: short fiber that conducts toward the cell body of the
         neuron