1) One-twentieth of a shekel 2) Weight jewish 
A gerah Hebrew `גרה` is an ancient Hebrew unit of weight and currency, equivalent to one-twentieth of a shekel, a shekel being 180 barleycorns or 60 carob divided by 20 = 3 carob. This is 0.568 grams. A gerah is in Aramaic a ma`ah `מעה` (pl. ma`ot `מעות` which means `money`). It was originally a fifth of a Denarius/zuz, as seen...
• (n.) A small coin and weight; 1-20th of a shekel.
Ge'rah noun [ Hebrew g...rah , lit., a bean.] (Jewish Antiq.) A small coin and weight; 1-20th of a shekel. » 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.
The gerah was an ancient Hebrew unit of weight.The gerah was an ancient Jewish monetary unit. It was one twentieth of a shekel.