noun, plural abacuses, abaci[ab-uh-sahy, -kahy, uh-bak-ahy]/ˈæb əˌsaɪ, -ˌkaɪ, əˈbæk aɪ/(Show IPA)
1. a device for making arithmetic calculations, consisting of a frame set with rods on which balls or beads are moved.
2. Architecture. a slab forming the top of the capital of a column.
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