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SLANDERER. A calumniator, who maliciously and without reason imputes a crime or fault to another, of which he is innocent.
     2. For this offence, when the slander is merely verbal, the remedy is an action on the case for damages; when it is reduced to writing or printing, it is a libel. (q.v.)

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in classic literature ?
Vice hath not, I believe, a more abject slave; society produces not a more odious vermin; nor can the devil receive a guest more worthy of him, nor possibly more welcome to him, than a slanderer. The world, I am afraid, regards not this monster with half the abhorrence which he deserves; and I am more afraid to assign the reason of this criminal lenity shown towards him; yet it is certain that the thief looks innocent in the comparison; nay, the murderer himself can seldom stand in competition with his guilt: for slander is a more cruel weapon than a sword, as the wounds which the former gives are always incurable.
With all this my good reader will doubtless agree; but much of it will probably seem too severe, when applied to the slanderer of books.
Again, though there may be some faults justly assigned in the work, yet, if those are not in the most essential parts, or if they are compensated by greater beauties, it will savour rather of the malice of a slanderer than of the judgment of a true critic to pass a severe sentence upon the whole, merely on account of some vicious part.
These children may most truly be called the riches of their father; and many of them have with true filial piety fed their parent in his old age: so that not only the affection, but the interest, of the author may be highly injured by these slanderers, whose poisonous breath brings his book to an untimely end.
Remember the prayer of our holy litany, where we implore the Divine Power—’that it may please thee to forgive our enemies, persecutors, and slanderers, and to turn their hearts.
There was a grin upon the ghastly countenance of the French gentleman under the influence of the firelight, as if he were computing how many thousand slanderers and traitors array themselves against the fortunate, on premises exactly answering to those of Mr Wegg.
The patient Year had lived through the reproaches and misuses of its slanderers, and faithfully performed its work.
Taking the bait, Akel chief Andros Kyprianou lambasted Neophytou, calling him a "common slanderer."
Former Federal Territories chief Razlan Rafii had called Ng on Twitter a 'slanderer' and described the DAP lawmaker as 'bad hearted' after the 40-year-old was killed in a car crash early this morning.
Don't use an accusatory tone (as much as you may think the slanderer deserves it) because that gives the other party something else to attack you about.
What precisely made the Life History's author take the bowed head of bust number 39 for A Hypocrite anda Slanderer (Fig.