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abaculus

noun abac·u·lus \ ə-ˈba-kyə-ləs \
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Definition of abaculus

plural abaculi \ə-ˈba-kyə-ˌlī, -ˌlē\
: a tile used in mosaic : tessera

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Origin and Etymology of abaculus

misreading of Latin ab oculīs “out of view,” as if diminutive of abacusabacus

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