gerah

Boyd’s Bible Dictionary:

One twentieth of a shekel; about 3 cents
(Ex. 30:13).

Concise Bible Dictionary:

See WEIGHTS AND MEASURES.

Strong’s Dictionary of Hebrew Words:

Transliteration:
gerah
Phonic:
gay-raw’
Meaning:
from 1641 (as in 1625); properly, (like 1620) a kernel (round as if scraped), i.e. a gerah or small weight (and coin)
KJV Usage:
gerah

Jackson’s Dictionary of Scripture Proper Names:

one twentieth of a shekel

From Manners and Customs of the Bible:

Leviticus 27:25. All thy estimations shall be according to the shekel of the sanctuary: twenty gerahs shall be the shekel.
1. What the “shekel of the sanctuary” was is not definitely stated. There are those who think it was worth double the value of the ordinary shekel. Others, again, suppose that “the shekel of the sanctuary” was the standard to which all shekels must conform if of full weight. See note on Genesis 23:16 (#26).
2. The gerah was the smallest weight known to the Hebrews, and the smallest. piece of money used by them. It weighed between eleven and twelve grains, and was in value about three cents.