cubit

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cubit

an ancient measure of length based on the length of the forearm
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Cubit

The principal measure of length used in Ancient Egypt, Babylon, Israel and Greece. It was based on the length of the forearm, and varied from 525 to 445 mm. This forearm measure was called “braccia” in medieval and Renaissance Italy, and varied from city to city.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

cubit

A linear unit of measurement used by the ancients; in ancient Egypt, equal to 20.62 in. (52.4 cm).
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.