Definition of abac in English:

abac

noun

rare
  • A type of nomogram in which the required value is determined by use of a ruler or other straight edge.

Origin

Late 19th century; earliest use found in The Academy: a monthly record of literature, learning, science, and art. From classical Latin abacus abacus, after French abaque. Compare earlier abacus.

Pronunciation:

abac

/ˈeɪbak/