The Collaborative International Dictionary of English v.0.48:

Nidulant \Nid"u*lant\, a. [L. nidulans, p. pr.: cf. F.
   Nidulant.]
   1. Nestling, as a bird in its nest.
      [1913 Webster]

   2. (Bot.) Lying loose in pulp or cotton within a berry or
      pericarp, as in a nest.
      [1913 Webster]