ge·rah /ˈgɪrə/
Ge·rah n. Jewish Antiq. A small coin and weight; 1-20th of a shekel.
Note: ☞ The silver gerah is supposed to have been worth about three cents; the gold about fifty-four cents; the weight equivalent to about thirteen grains.
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Gerah
a bean, probably of the carob tree, the smallest weight, and
also the smallest piece of money, among the Hebrews, equal to
the twentieth part of a shekel (Ex. 30:13; Lev. 27:25; Num.
3:47). This word came into use in the same way as our word
"grain," from a grain of wheat.