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Answer for the clue "Calculator ancestors ", 8 letters:
abacuses

Alternative clues for the word abacuses

Word definitions for abacuses in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Abacus \Ab"a*cus\ ([a^]b"[.a]*k[u^]s), n.; E. pl. Abacuses ; L. pl. Abaci (-s[imac]). [L. abacus, abax, Gr. 'a`bax] A table or tray strewn with sand, anciently used for drawing, calculating, etc. [Obs.] A calculating table or frame; an instrument for ...

Wiktionary Word definitions in Wiktionary
alt. (plural of abacus English) n. (plural of abacus English)

Usage examples of abacuses.

On the left, clerks wrote up orders and calculated prices on their abacuses at desks ranged along an aisle that extended to the back of the building.

The furniture too was a strange blend of this and past ages: stainless steel desks and chairs, seated secretaries working with abacuses and inscribing the figures on parchment with quill pens.