Source : Webster's Revised Unabridged Dictionary (1913)

Nidamental \Nid`a*men"tal\, a. [L. nidamentum materials for a
   nest, fr. nidus nest. See {Nest}.] (Zo["o]l.)
   Of, pertaining to, or baring, eggs or egg capsules; as, the
   nidament capsules of certain gastropods; nidamental glands.
   See Illust. of {Dibranchiata}.