Abacus
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GRE 蓝宝
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[编辑] GRE 红宝书
[编辑] Webster Collegiate
noun (plural abaci or abacuses)
- Etymology: Latin, from Greek abak-, abax, literally, slab
- Date: 14th century
- 1. an instrument for performing calculations by sliding counters along rods or in grooves
- 2. a slab that forms the uppermost member or division of the capital of a column
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4个分类: GRE单词 | GRE红宝书单词 | WebGRE词汇 | GREWordWithPicture
