n. 1. an underground bed or layer yielding ground water for wells and springs etc.; as, the Oglala aquifer. The water contained in an aquifer may be of great age, and in such cases is sometimes called fossil water. [ WordNet 1.5 +PJC ]
a. [ L. aqua water + -ferous. ] Consisting or conveying water or a watery fluid; as, aquiferous vessels; the aquiferous system. [ 1913 Webster ]