abacist
noun
aba·cist
ˈa-bə-sist,
-kist,
ə-ˈba-kist
plural -s
: one that uses an abacus
Word History
Etymology
Middle English, borrowed from Medieval Latin abacista, from Latin abacus abacus + -ista -ist entry 1
First Known Use
14th century, in the meaning defined above