abac·u·lus
| \ ə-ˈba-kyə-ləs \
plural abaculi\
ə-ˈba-kyə-ˌlī , -ˌlē
\
Definition of abaculus
: a tile used in mosaic : tessera
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Merriam-Webster unabridged
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Time Traveler for abaculus
The first known use of abaculus was in 1844
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