Definition of the royal arms noun from the Oxford Advanced Learner's Dictionary

 

the royal arms

 noun
noun
BrE
 
; NAmE
 
[plural]
 
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the personal symbol of the British king or queen, consisting of a lion and a unicorn holding a shield, on which other symbols represent England, Scotland and Ireland. The words Honi soit qui mal y pense (the motto (= phrase expressing an aim or a belief) of the Order of the Garter) are written on a belt around the shield. Underneath are the words Dieu et mon droit (the personal motto of the king or queen). Companies with a royal warrant to supply goods to members of the royal family may use the royal arms on their products, etc.