n. An error made when writing longhand.
I think there is a 'writo' on line 7: I'm sure you'll agree that "X(n) log n" should read "X(n/(p-1)) log n" ?
Before the time of keyboards/keypunches, were spelling errors referred to as "Writos?"
I am myself a somewhat expert speller but have noticed that, when writing quickly, I make mistakes (including here, just a moment ago) which I am quite capable of subsequently correcting myself. In other words, there's a difference between a spelling mistake and a typo — or indeed, a 'writo,' for want of a better word.
He moved on to discuss errors beyond the typo — the speako, the writo, and ultimately the conceivo (walking up to the combination-locked door on our computer lab, I reach into my pocket and pull my keys out).