A measure used among the ancients. A cubit was originally the distance from the elbow to the extremity of the middle finger, which is the fourth part of a well-proportioned man's stature. The Hebrew cubit, according to some, is twenty-one inches; but others fix it at eighteen. The Talmudists observe that the Hebrew cubit was larger by one quarter than the Roman.
Although written in 1859 by William Rand, this dictionary of the Bible from the American Tract Society is still relevant today.Wikipedia
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