Webster's English Dictionary

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helmet

hel.met \'hel-m*t\ \-.li-k\ n [MF, dim. of helme helmet, of Gmc origin; 
   akin to OE helm helmet, O]HG helan to conceal - more at HELL 1: a covering 
   or enclosing headpiece of ancient or medieval armor  2: any of various 
   protective head coverings usu. made of a hard material to  resist impact 3: 
   something resembling a helmet; specif : a hood-shaped upper sepa l or petal 
   of some flowers - hel.met.like aj