Wiktionary
Usage examples of "infills".
Rue had decorated this room herself, lovingly waxing the beams and then painting their ancient plaster infills with a special lime wash stained palest ochre, which gave the plaster a soft, warm glow.
Five years ago she would not even have known the importance of painting traditional plaster infills with lime wash instead of modern paint--and five years ago she would certainly never have dreamed of doing such work herself.