[an.nul] vt an.nulled ; an.nul.ling [ME annullen, fr. MF annuller, fr. LL annullare, fr. L ad- + nullus not any--more at null] (15c) 1: to reduce to nothing: obliterate
2: to make ineffective or inoperative: neutralize "~ the drug's effect"
3: to declare or make legally invalid or void "wants the marriage annulled" syn see nullify