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单词 rustball
释义

Definition of rustball in English:

rustball

noun
  • Geology a roughly spherical mass or nodule of iron ore; (also more widely) a lump of oxidized iron.

Origin

Late 17th century; earliest use found in Robert Plot (bap. 1640, d. 1696), naturalist and antiquary.

Definition of rustball in US English:

rustball

noun
  • Geology a roughly spherical mass or nodule of iron ore; (also more widely) a lump of oxidized iron.

Origin

Late 17th century; earliest use found in Robert Plot (bap. 1640, d. 1696), naturalist and antiquary.

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