noun
a plural form of the noun 'abaciscus', which refers to a small abacus used in ancient Rome for counting and calculating
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The abacisci in the library are used to calculate complex mathematical equations.
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I found some old abacisci in my grandma's attic, they look pretty cool.
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Check out these abacisci, they're like ancient calculators!
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The abacisci of history help us understand the past in a tangible way.