The meaning of Gerah in the Bible
(From Easton's Bible Dictionary)

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 (Exodus 30:13; Leviticus 27:25; Numbers 3:47). This word came into use in the same way as our word "grain," from a grain of wheat.

See more on the meaning of Gerah in the Bible:
Gerah {International Standard Bible Encyclopedia}

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