From The Collaborative International Dictionary of English v.0.48 [gcide]:
1. An ornamental or honorary headdress, having the shape and character of a crown; particularly, a crown worn as the mark of high rank lower than sovereignty. The word is used by Shakespeare to denote also a kingly crown.
Note: The coronet of the Prince of Wales consist of a circlet of gold with four crosses patt['e]e around the edge between as many fleurs-de-lis. The center crosses are connected by an arch which is surmounted by a globe or cross. The coronet of a British duke is adorned with strawberry leaves; that of a marquis has leaves with pearls interposed; that of an earl raises the pearls above the leaves; that of a viscount is surrounded with pearls only; that of a baron has only four pearls.
From WordNet (r) 3.0 (2006) [wn]:
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