• A piece of armor that covers the head; a helmet.
  • A helmetlike structure or protuberance.
  • A helmet of any kind.
  • In <em>zoology</em>, some process or formation on the head resembling a helmet; a galea.
  • A piece of defensive or ornamental armor (with or without a vizor) for the head and neck; a helmet.
  • A <xref>visorless</xref> <xref>helmet</xref>.
  • A hard structure on the head of some birds, such as the <xref>hornbill</xref> or <xref>cassowary</xref>.
  • (15-16th century) any armor for the head; usually ornate without a visor
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