Where does “pictum” come from?

pictum (Latin) comes from Latin pingo, from Latin pango, from Proto-Italic pangō, from Proto-Indo-European peh₂ǵ- — to attach.

pictum (Latin): accusative supine of pingō

Definitions

Step	Language	Word	Meaning
1	Latin	pingo	I decorate or embellish; I paint, tint or colour;...
2	Latin	pango	I fasten, fix, set, especially drive, sink, force...
3	Proto-Italic	pangō	to fasten, to fix
4	Proto-Indo-European	peh₂ǵ-	to attach

pictum — Etymology, Origin & Word History | Etymology Explorer