Diadem

a crown or cloth band worn around the head.
Found on http://www.encyclo.co.uk/local/10135

Diadem

Operational code name for Allied offensive in Italy towards Rome in 1944
Found on http://www.secondworldwar.co.uk/glossd.html

Diadem

Series of 1st class armoured cruisers [UK]
Found on http://www.jedsite.info/index.html

diadem

noun an ornamental jewelled headdress signifying sovereignty
Found on http://wordnetweb.princeton.edu/perl/webwn?s=diadem

diadem

(from the article `jewelry`) Also worthy of high consideration are the magnificent diadems that came into wide use as a result of the Persian conquests made by Alexander the ... ...by the Berber and Arab tribes. In design the jewelry of southern Morocco shows curious analogies to Byzantine jewelry—heavy silver plaques ... ...ran...
Found on http://www.britannica.com/eb/a-z/d/41

Diadem

A jeweled headband.
Found on http://www.encyclo.co.uk/local/21746

diadem

A semi-circular or circular piece of jewellery worn on the head. Also known as a tiara
Found on http://www.saffronart.com/sitepages/jewelry/glossary.aspx

diadem

A semi circular band worn around the head (tiara). It is usually jeweled and three dimensional.
Found on http://www.encyclo.co.uk/local/22290

diadem

an ornamental jeweled headdress signifying sovereignty
Found on https://www.vocabulary.com/lists/51729
No exact match found