n.
Pronunciation: ' a-b ə -k ə s, ə - ' ba-
Function: noun
Inflected Form: plural aba · ci \ ' a-b ə - ˌ s ī , - ˌ k ē ; ə - ' ba- ˌ k ī \ or aba · cus · es
Etymology: Latin, from Greek abak-, abax, literally, slab
Date: 14th century
1 : an instrument for performing calculations by sliding counters along rods or in grooves
2 : a slab that forms the uppermost member or division of the capital of a column
abacus