psephicity
n. 硬圆度;磨圆度
例句
It has high psephicity, low surface strengths, high porosity and intensive capillarity because of the long transport function of the water.
由于黄河水的长距离搬运作用,颗粒磨圆度高、表面强度低;孔隙率高,毛细作用剧烈。