Webster, as ever, confuses the issue. Passion Week could easily refer to the week following Passion Sunday. Maundy Thursday is the Thursday in Holy Week. This is the day on which the British Monarch distributes the Maundy Money - an act of symbolic almsgiving. Many churches have vigils, foot-washing rituals and other observations. This is also the original day for the commemoration of the Last Supper, Corpus Christi being a later introduction.

Office hymn: Pange lingua gloriosi corporis mysterium

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Footnote: Dante's Divine Comedy begins on this day. The Inferno lasts from the Thursday afternoon to the Friday night.