from the GNU version of the Collaborative International Dictionary of English
- A word appended to the artist's name or initials on a painting, or engraved copy of a painting.
from The Century Dictionary and Cyclopedia
- A word occurring as a part of a marginal note on a picture, noting who painted it: as, Rubens pinxit, ‘Rubens painted (this).’ Abbreviated pinx. and pxt.
Sorry, no etymologies found.