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An abstemius is one who cannot take wine without risk of vomiting. As, therefore, the consecration at Mass must be effected in both species, of bread and wine, an abstemius is consequently irregular.

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An abstemius (plural abstemii) is one who cannot take wine without risk of vomiting. As, therefore, the consecration at Mass must be effected in both species, of bread and wine, an abstemius is consequently irregular.