Pr.

详细解释:【医】 老视, 棱晶, 棱镜, 镨(59号元素)

英语解释：

名词 pr.:

a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process同义词：praseodymium, Pr, atomic number 59