Stucchi

The draperies and features are modelled with the utmost nicety, even insomuch as to give the appearance of stucchi of the most careful and spirited execution.

Source: wiktionary

In a letter of February 16, 1563, Vasari (Carteggio, 1, pp. 713 ff) speaks of frescoes to be executed for the choir, for the four large lunettes at the top, for the four tondi and the four pendentives; he speaks also of stucchi in the second zone (probably in the rectangular fields above the smaller lunettes).

Source: wiktionary

Cardinal del Monte, on the eve of his becoming Pope Julius III, built himself one of the most decorative palaces in Rome, later acquired by Cardinal Spada which, on account of its profusion of stucchi on the façade and in the courtyard, has been ascribed to Giulio Mazzoni. […] Richly decorative façade of Palazzo Podestà (1563), overlaid with ornamental stucchi and Mannerist motifs: […]

Source: wiktionary

Above the whole were vaults all around, ten feet high, ornamented with marvelous narrative reliefs of stucchi and figures.

Source: wiktionary