psellism                stuttering or stammering.
battology               excessive repetition of words.
ploce                   (rhet.) repetition of a phrase.
psittacism              meaningless, repetitive speech.
pleonasm                redundancy; a redundant word or expression.
gemination              duplication; repetition for rhetorical effect.
mussitation             motion of the verbal apparatus, forming
                        soundless speech; muttering. 
floccilation            delirious picking at the bedclothes.