relative clause

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A dependent clause introduced by a relative pronoun, as which is downstairs in The dining room, which is downstairs, is too dark.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun grammar A subordinate clause that modifies a noun.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a clause introduced by a relative pronoun