Dictionary:

ephah

  (ē'fə, ĕf'ä)

An ancient Hebrew unit of dry measure, equal to a tenth of a homer or about one bushel (35 liters).

[Hebrew 'êpâ, probably from Egyptian 'pt.]

1. The firstborn son of Midian, fourth son of Abraham by Keturah.
2. A concubine of Caleb, son of Hezron, who bore him Haran, Moza and Gazez.
3. The fifth son of Jahdai in the genealogy of Caleb.
4. A place noted for its young camels.

Concordance
EPHAH 1: Gen 25:4. I Chr 1:33
EPHAH 2: I Chr 2:46
EPHAH 3: I Chr 2:47
EPHAH 4: Is 60:6

The noun has one meaning:

Meaning #1: an ancient Hebrew unit of dry measure equal to about a bushel
  Synonym: epha