abacus

[ ab-uh-kuh s, uh-bak-uh s ]
/ ˈæb ə kəs, əˈbæk əs /

noun, plural ab·a·cus·es, ab·a·ci [ab-uh-sahy, -kahy, uh-bak-ahy] /ˈæb əˌsaɪ, -ˌkaɪ, əˈbæk aɪ/.

a device for making arithmetic calculations, consisting of a frame set with rods on which balls or beads are moved.
Architecture. a slab forming the top of the capital of a column.

Origin of abacus

1350–1400; Middle English < Latin: board, counting board, re-formed < Greek ábax
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for abacus

abacus
/ (ˈæbəkəs) /

noun plural -ci (-ˌsaɪ) or -cuses

a counting device that consists of a frame holding rods on which a specific number of beads are free to move. Each rod designates a given denomination, such as units, tens, hundreds, etc, in the decimal system, and each bead represents a digit or a specific number of digits
architect the flat upper part of the capital of a column

Word Origin for abacus

C16: from Latin, from Greek abax board covered with sand for tracing calculations, from Hebrew ābhāq dust
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012