vaseline /ˈvæ.sə.liːn/noun 3verb 1forms 3 noun3 •Petroleum jelly.Hearts of putty, hearts of vaseline... — 1930 •Any particular kind of petroleum jelly or of any similar lubricant.A Russian vaseline has been lately added to the many kinds of vaseline found in […] — 1882 •(informal) a yellow or yellow-green glass made with a little uranium, so that it glows bright green under ultraviolet light verb1 •To lubricate with vaseline.Even at this late date, vaselining will preserve the best of these leathers. formsvaselined · vaselining · vaselines