gunstone

From Middle English gunneston; equivalent to gun +‎ stone: they were originally made from stone.

gunstone (plural gunstones)

1. (obsolete) A cannonball.
   • c. 1599, William Shakespeare, Henry V, act 1, scene 2:

     And tell the pleasant prince this mock of his / Hath turn'd his balls to gunstones

   • 2003, Patrick W. Montague-Smith, Debrett's Peerage and Baronetage, page 911:

     [...] sable supporting with the forelegs a lance argent flying therefrom a forked pennon per fess gules and argent. Supporters – Dexter, a sea-horse per fess argent and vert gorged with a mural crown vert pendent therefrom a gunstone […]

• nonguest, onguents

gunstone

1. Alternative form of gunneston