The Collaborative International Dictionary
Disclaunder
Disclaunder \Dis*claun"der\, v. t. [From OE. disclaundre, n., for sclandre, esclandre, OF. esclandre. See Sclaundre, Slander.] To injure one's good name; to slander. [Obs.]
Wiktionary
disclaunder
vb. (context obsolete English) To slander.