Where does “abacist” come from?

abacist (English) comes from Medieval Latin abacista, from Latin -ista, from Ancient Greek -ιστής, from Ancient Greek -τής, from Proto-Hellenic -tās.

abacist (English): One who uses an abacus in casting accounts; a...

Definitions

Step	Language	Word	Meaning
1	Medieval Latin	abacista	—
2	Latin	-ista	-ist; one who practises or believes
3	Ancient Greek	-ιστής	Alternative form of -τής; -ist
4	Ancient Greek	-τής	Appended to verbs to form agent nouns
5	Proto-Hellenic	-tās	—