Other forms: diadems
A diadem is a jewelled band worn as a mark of royalty. A jewelled diadem, wear the diadem, the diadem of the queen.
It differs from a crown by being a band rather than a closed cap, and it is older, since the Greek original was a cloth fillet tied round the head. The Greek means a thing bound around.
1noundiademA jewelled band worn as a mark of royalty.
“The empress wore a diamond diadem in her official portrait.”
diadem is a headband.
Greek diadema means a band bound around, from dia plus dein, to bind.
Ancient Greek
διάδημα — band, especially worn around a tiara
Latin
diadēma
Old French
diademe
Middle English
diademe
English, today
diadem
Built from
From Middle English diademe, dyademe, from Old French diademe, from Latin diadēma, from Ancient Greek διάδημα (“band, especially worn around a tiara”), from διαδέω (“bind around”).
Etymology from Wiktionary, CC BY-SA