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The word is generally used by Ruskin to refer to the moulding of the face of an arch. An example is the round arched water door of the Ca’ Bosso to the left of the Ponte San Toma, of which the archivolt is shown at Bit Book p.1. The diagram there is the basis of the Figure 4 of Plate VIII at Works, 11.269.
The arch is shown below in a modern photograph with much the same structure as it had when Ruskin saw it:
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The diagram of the archivolt in Bit Book p.1 is shown below:
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Sections of the archivolt with the sequence of grey stone, red Verona, white marble, and red Verona, as well as the pilaster head of red marble may be seen in the following details:
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and the same sequence, as well as the pilaster head of red Verona, is shown below:
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The lower image is at the bottom of the archivolt, and when rotated to the right the sequence of the mouldings of the archivolt is clearly that of the diagram at Bit Book p.1:
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[Version 0.05: May 2008]