biquinary abacus

biquinary abacus

[bī′kwin·ə·rē ′ab·ə·kəs]

(mathematics)

An abacus in which the frame is divided into two parts by a bar which separates each wire into two- and five-counter segments.

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.