THESAURUS
thumbprint
boss, bump, colophon, concavity, convexity, dactylogram, dactylograph, dent, dint, embossment, excrescence, fingerprint, footmark, footprint, footstep, fossil footprint, ichnite, ichnolite, impress, impression, imprint, indent, indentation, indention, lump, pad, paw print, pawmark, pimple, print, pug, pugmark, seal, sigil, signet, stamp, step, stud, thumbmark, vestige