coronet

Concise Oxford English Dictionary © 2008 Oxford University Press:
coronet /ˈkɒr(ə)nɪt/

▶noun

• 1 a small or simple crown, especially as worn by lesser royalty and nobles.

  ■ a circular decoration for the head.

• 2 a ring of bone at the base of a deer's antler.

• 3 the band of tissue containing the horn-producing cells from which a horse's hoof grows.

– derivatives
coroneted adjective.

– origin ME: from OFr. coronete, dimin. of corone (see crown).