noun a preparation containing mercury.
2. mercurial ·noun a person having mercurial qualities.
3. mercurial ·adj caused by the use of mercury; as, mercurial sore mouth.
4. mercurial ·adj having the form or image of mercury;
applied to ancient guideposts.
5. mercurial ·adj of or pertaining to mercury as the god of trade; hence, money-making; crafty.
6. mercurial ·adj of or pertaining to, or containing, mercury; as, mercurial preparations, barometer. ·see mercury, 2.
7. mercurial ·adj having the qualities fabled to belong to the god mercury; swift; active; sprightly; fickle; volatile; changeable; as, a mercurial youth; a mercurial temperament.