fath'-um (~orguia): The literal meaning is the length of the outstretched arms, and it was regarded as equal to 4 cubits, or about 6 feet. (Acts 27:28). See WEIGHTS AND MEASURES.
Bibliography Information Orr, James, M.A., D.D. General Editor. "Definition for 'FATHOM'". "International Standard Bible Encyclopedia". bible-history.com - ISBE; 1915.