Both Uses

slander
in
Catch-22
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A virgin audience like Colonel Scheisskopf was grist for General Peckem's mill, a stimulating opportunity to throw open his whole dazzling erudite treasure house of puns, wisecracks, slanders, homilies, anecdotes, proverbs, epigrams, apophthegms, bon mots and other pungent sayings.†
Chpt 29

slanders = lies that damage the reputation of another; or the process of telling such lies
It was almost no trick at all, he saw, to turn vice into virtue and slander into truth, impotence into abstinence, arrogance into humility, plunder into philanthropy, thievery into honor, blasphemy into wisdom, brutality into patriotism, and sadism into justice.†
Chpt 34 *

slander = lie in such a way as to damage the reputation of another; or the lies told

Definitions:

(1) (slander)
lie to damage the reputation of another; or the lies told

The legal distinction between libel and slander is that libel is an oral offense while slander is written or published.
(2) (meaning too rare to warrant focus)