n.
Pronunciation: ' mär-k ə - ˌ s ī t, - ˌ z ī t; ˌ mär-k ə - ' z ē t
Function: noun
Etymology: Middle English marchasite, from Medieval Latin marcasita
Date: 15th century
1 a : crystallized pyrite b : a pale yellow to white mineral of the same composition and appearance as pyrite but of different crystalline organization and lower specific gravity
2 : a piece of marcasite used in jewelry