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abacus
Abadan
Abaddon
abaft
Abakan

abacus  n pl , -ci , -cuses 
1 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 
2  (Architect) the flat upper part of the capital of a column 
 (C16: from Latin, from Greek abax board covered with sand for tracing calculations, from Hebrew abhaq dust)