1) Formation 2) Geological formation 3) Of or relating to an aquifer 
• (a.) Consisting or conveying water or a watery fluid; as, aquiferous vessels; the aquiferous system.
A·quif'er·ous adjective [ Latin aqua water + -ferous .] Consisting or conveying water or a watery fluid; as, aquiferous vessels; the aquiferous system. 
[adj] - of or relating to an aquifer
aquiferous 1. Carrying, yielding, or containing water; aquifer. 2. Water-bearing stratum.
adjective of or relating to an aquifer