dentil
noun
any of a series of closely spaced, small, rectangular blocks, used especially in classical architecture beneath the coronas of Ionic, Corinthian, and Composite cornices.
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No. 1376 is the common dentiled cornice, which occurs repeatedly in St. Mark’s; and, as late as the thirteenth century, a reduplication of it, forming the abaci of the capitals of the Piazzetta shafts.
From The Stones of Venice, Volume I (of 3) by John Ruskin