The Collaborative International Dictionary of English v.0.48:

Ephah \E"phah\, or Epha \E"pha\, n. [Heb. '[=e]ph[=a]h.]
   A Hebrew dry measure, supposed to be equal to two pecks and
   five quarts. Ten ephahs make one homer.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ephah
    n 1: an ancient Hebrew unit of dry measure equal to about a
         bushel [syn: ephah, epha]

Easton's 1897 Bible Dictionary:

Ephah
   gloom. (1.) One of the five sons of Midian, and grandson of
   Abraham (Gen. 25:4). The city of Ephah, to which he gave his
   name, is mentioned Isa. 60:6, 7. This city, with its surrounding
   territory, formed part of Midian, on the east shore of the Dead
   Sea. It abounded in dromedaries and camels (Judg. 6:5).

     (2.) 1 Chr. 2:46, a concubine of Caleb.

     (3.) 1 Chr. 2:47, a descendant of Judah.

     Ephah, a word of Egyptian origin, meaning measure; a grain
   measure containing "three seahs or ten omers," and equivalent to
   the bath for liquids (Ex. 16:36; 1 Sam. 17:17; Zech. 5:6). The
   double ephah in Prov. 20:10 (marg., "an ephah and an ephah"),
   Deut. 25:14, means two ephahs, the one false and the other just.


Hitchcock's Bible Names Dictionary (late 1800's):

Ephah, weary; tired