Definition of marcasite noun from the Oxford Advanced Learner's Dictionary

 

marcasite

 noun
noun
BrE BrE//ˈmɑːkəsaɪt//
 
; NAmE NAmE//ˈmɑːrkəsaɪt//
 
; BrE BrE//ˈmɑːkəziːt//
 
; NAmE NAmE//ˈmɑːrkəziːt//
 
[countable, uncountable]
 
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a yellow semi-precious stone used in jewellery Word Origin late Middle English: from medieval Latin marcasita, from Arabic marqašīt̲a, from Persian.
See the Oxford Advanced American Dictionary entry: marcasite