Noun
A visually evocative poem or other piece of writing.
The act of writing such a piece.
(music) Program music, or the process of composing it.
Source: en.wiktionary.orgword-painting
A few motets, especially in the 1591 set, abandon traditional motet style and resort to vivid word painting which reflects the growing popularity of the madrigal (Haec dies, 1591). Source: Internet
In 1631 he published a number of masses, which were much more baroque, with basso continuo, rhetorical word painting and obligato usage of instruments. Source: Internet