冠状物 meaning in Chinese

coronal
crown

A crown for covering or sealing a tooth
齿冠遮盖或密封牙齿的冠状物
Miscellany - the red corundum grains in some of the ruby . . . zoisite rocks have corona like shell consisting of an off - white to yellowish material that , according to chris wright of wright ' s rock shop , hot springs , arkansas ( personal communication , july , 2005 ) are " variations in the zoisite "
备注：在某些红宝石里有红刚玉的交叉双晶，有的黝帘石岩石有象贝壳样的冠状物，颜色为白色到淡黄色，属于一种变种的黝帘石。