Li'brary of Con'gress
one of the major library collections in the world, located in Washington, D.C., and functioning in some ways as the national library of the U.S. although not officially designated as such: established by Congress in 1800 for service to its members, but now also serving government agencies, other libraries, and the public. Cf. national library.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.