
1) Cabasset 2) Crested helmet of old 3) Helmet 
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https://www.crosswordclues.com/clue/morion

1) Cabasset 
Found on 
https://www.crosswordclues.com/clue/morion
 [genus]
[genus]  Morion is a genus of beetles in the family Carabidae, containing the following species: ...
Found on 
http://en.wikipedia.org/wiki/Morion_(genus)
 [helmet]
[helmet]  A morion is a type of open helmet used from the middle 16th and early 17th centuries, usually having a flat brim and a crest from front to back. Its introduction was contemporaneous with the exploration of North, Central, and South America. Explorers like Hernando de Soto and Coronado may have supplied them to their foot soldiers i...
Found on 
http://en.wikipedia.org/wiki/Morion_(helmet)

open helmet without visor
Found on 
http://phrontistery.info/m.html

• (n.) A kind of open helmet, without visor or beaver, and somewhat resembling a hat. • (n.) A dark variety of smoky quartz.
Found on 
http://thinkexist.com/dictionary/meaning/morion/

crested 16th- 17thC metal helmet with the brim upcurving at front and rear.
Found on 
http://www.encyclo.co.uk/visitor-contributions.php
 Mo'ri·on  noun
Mo'ri·on  noun [ French 
 morion , Spanish 
 morrion ; confer Spanish 
 morra the upper part of the head, 
 morro anything that is round.] A kind of open helmet, without visor or beaver, and somewhat resembling a hat. « A battered 
 morion on his brow.» 
 Sir W....Found on 
http://www.encyclo.co.uk/webster/M/102

A morion was a helmet made of iron, steel or brass, somewhat like a hat in shape, often with a crest or comb over the top, and without a beaver or visor. They were introduced into Britain from France or Spain around the beginning of the 16th century.
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http://www.probertencyclopaedia.com/browse/FM.HTM

[
n] - a metal helmet worn by common soldiers in the 16th century
Found on 
http://www.webdictionary.co.uk/definition.php?query=morion
 [Ivanhoe]
[Ivanhoe] a foot soldier's visor-less high crested helmet
Found on 
https://www.cliffsnotes.com/literature/i/ivanhoe/study-help/full-glossary
 cabasset noun
cabasset noun a metal helmet worn by common soldiers in the 16th century
Found on 
https://www.encyclo.co.uk/local/20974

an open helmet of the 16th and early 17th centuries, worn by common soldiers and usually having a flat or turned-down brim and a crest from front to back.
Found on 
https://www.infoplease.com/dictionary/morion
  No exact match found.