abacist|ˈæbəsɪst|[ad.late L. abacista,f.abacus: see -ist.]‘One who uses an abacus in casting accounts; a calculator.’ T.1387TrevisaHigden's Polychr. (RollsSer.) VII. 69He[Gerebertus]was þe firste þat took abacus of Sarsyns, and ȝaf rules þer ynne, þat mowe unneþe be understonde of þe kunnyngeste men of þe craft, þe whiche craftes men beþ cleped abaciste.[Vix ab acutis abacistis intelliguntur.]1872WhartonLawLex.Abacist or Abacista, a caster of accounts, an arithmetician.