The Collaborative International Dictionary of English v.0.48:
Testern \Tes"tern\, n.
A sixpence; a tester. [Obs.]
[1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Testern \Tes"tern\, v. t.
To present with a tester. [Obs.] --Shak.
[1913 Webster]