freestone

【化】 易切砂岩; 易劈石; 离核; 离核果实

free.stone

n.（名词）
A stone, such as limestone, that is soft enough to be cut easily without shattering or splitting.
乱石：一种质地很软以致于不须砸或劈就能被轻易截断的石头，如石灰石
A fruit, especially a peach, that has a stone not adhering to the pulp.
离核果实：一种核没连在果肉上的水果，尤指桃子

来源：
Middle English freston
中古英语 freston
translation of Old French franche pere [high-grade stone]
古法语 franche pere的翻译 [金属含量丰富的石头]
franche [high-grade] [feminine of] franc [noble, freeborn]
franche [金属含量丰富的] [] franc的阴性词 [高贵的，生来自由的]
pere [stone]
pere [石头]