Entry from British & World English dictionary
1 Medicine The removal of material from a body cavity (especially the lung) by blowing: only 7.7% of patients required exsufflation or drainage 2
• rare The action or process of breathing out; exhalation.
2.1 Theology The action of blowing as a form of exorcism or to symbolize renunciation of the devil: sometimes the exorcist used the rite of exsufflation
early 16th century: late Latin, from the verb exsufflare, from ex- 'out' + sufflare 'to blow'.
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