名詞 freestone:

1. fruit (especially peach) whose flesh does not adhere to the pit

free.stone

n.（名詞）
A stone, such as limestone, that is soft enough to be cut easily without shattering or splitting.
亂石：一種質地很軟以致于不須砸或劈就能被輕易截斷的石頭，如石灰石
A fruit, especially a peach, that has a stone not adhering to the pulp.
離核果實：一種核沒連在果肉上的水果，尤指桃子

來源：
Middle English freston
中古英語 freston
translation of Old French franche pere [high-grade stone]
古法語 franche pere的翻譯 [金屬含量豐富的石頭]
franche [high-grade] [feminine of] franc [noble, freeborn]
franche [金屬含量豐富的] [] franc的陰性詞 [高貴的，生來自由的]
pere [stone]
pere [石頭]