Search Result for "aquifer": 
Wordnet 3.0

NOUN (1)

1. underground bed or layer yielding ground water for wells and springs etc;


The Collaborative International Dictionary of English v.0.48:

aquifer \aquifer\ 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]
WordNet (r) 3.0 (2006):

aquifer n 1: underground bed or layer yielding ground water for wells and springs etc