The Collaborative International Dictionary of English v.0.48:

Bascinet \Bas"ci*net\, n. [OE. bacinet, basnet, OF. bassinet,
   bacinet, F. bassinet, dim. of OF. bacin, F. bassin, a helmet
   in the form of a basin.]
   A light helmet, at first open, but later made with a visor.
   [Written also basinet, bassinet, basnet.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Basinet \Bas"i*net\, n.
   Same as Bascinet.
   [1913 Webster]

WordNet (r) 3.0 (2006):

basinet
    n 1: a medieval steel helmet