American Heritage Dictionary
(1)
Century Dictionary
(1)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
Lamorena says as the government moves forward with zone changes, the protection of the aquifer is the primary reason to get the plan moving.— KUAM.com - KUAM News
Stretching from Ashton to King Hill, the aquifer is a critically important water source for farmers and communities in much of southern Idaho.— IdahoStatesman.com News Updates
With time, and a more sophisticated understanding of hydrology, Idahoans now recognize that the aquifer is gradually depleting.— IdahoStatesman.com News Updates
Cold water comes out of the aquifer, at the Thousand Springs area near Hagerman, feeding the Snake River.— IdahoStatesman.com News Updates
An aquifer is a geologic formation, group of formations, or part of a formation that contains sufficient saturated permeable material to yield significant quantities of water to— Featured Articles - Encyclopedia of Earth

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word several times a year.