slander

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

• noun Law Oral communication of false and malicious statements that damage the reputation of another.
• noun A false and malicious statement or report about someone.
• intransitive verb To utter a slander about. synonym: malign.
• intransitive verb To utter or spread slander.

from The Century Dictionary.

• To be a stumbling-block to; give offense to; offend.
• To discredit; disgrace; dishonor.
• To speak ill of; defame; calumniate; disparage.
• Specifically In law, to utter false and injurious tales or reports regarding; injure or tarnish the good name and reputation of, by false tales maliciously told or propagated. See slander, n., 4, and compare libel.
• To reproach; charge: with with.
• Synonyms Defame, Calumniate, etc. See asperse.
• noun A cause of stumbling or offense; a stumbling-block; offense.
• noun Reproach; disgrace; shame; scandal.
• noun Ill fame; bad name or repute.
• noun A false tale or report maliciously uttered, and intended or tending to injure the good name and reputation of another: as, a wicked and spiteful slander; specifically, in law, oral defamation published without legal excuse (Cooley).
• noun The fabrication or uttering of such false reports; aspersion; defamation; detraction: as, to be given to slander.

from the GNU version of the Collaborative International Dictionary of English.

• noun A false tale or report maliciously uttered, tending to injure the reputation of another; the malicious utterance of defamatory reports; the dissemination of malicious tales or suggestions to the injury of another.
• noun Disgrace; reproach; dishonor; opprobrium.
• noun (Law) Formerly, defamation generally, whether oral or written; in modern usage, defamation by words spoken; utterance of false, malicious, and defamatory words, tending to the damage and derogation of another; calumny. See the Note under Defamation.
• transitive verb To defame; to injure by maliciously uttering a false report; to tarnish or impair the reputation of by false tales maliciously told or propagated; to calumniate.
• transitive verb To bring discredit or shame upon by one's acts.

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

• noun a false, malicious statement (spoken or published), especially one which is injurious to a person's reputation; the making of such a statement
• verb to utter a slanderous statement

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

• verb charge falsely or with malicious intent; attack the good name and reputation of someone
• noun words falsely spoken that damage the reputation of another
• noun an abusive attack on a person's character or good name