Basinet or Bacinet
[bas-uh-nit, -net, bas-uh-net]
Etymology: Middle English bacinet, from Anglo-French, diminutive of bacin
Relatively light helmet with a rounded or pointed top. It might be fitted with a visor.
(Prestwich, Michael. Armies and Warfare in the Middle Ages: The English Experience, 347)
*term definition retrieved from Netserf’s Medieval Glossary (http://www.netserf.org/Glossary)