1. the source of a stream, spring, etc.; fountainhead
2. a source of abundant and continual supply
⇒ a wellspring of knowledge
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.