The Collaborative International Dictionary of English v.0.48:

Enation \E*na"tion\, n. (Bot.)
   Any unusual outgrowth from the surface of a thing, as of a
   petal; also, the capacity or act of producing such an
   outgrowth.
   [1913 Webster]

WordNet (r) 3.0 (2006):

enation
    n 1: line of descent traced through the maternal side of the
         family [syn: matrilineage, enation, cognation]
    2: a natural projection or outgrowth from a plant body or organ
       [syn: plant process, enation]