[Cob] grog the pozzolan

[Amanda Peck]

The clay supply company called it grog because that's what potters always 
call it.  Doesn't turn up in a definition search.

But apparently even the unabridged OED only lists watered rum as a 
definition, according to this--1982--article (Although the author's 
name--Kreuger--means pot-maker and one could make a vague connection between 
Kreug->greug>grog.  Or even Crock might end up as grog.):

http://www.studiopotter.org/articles/?art=art0001

Four words whose origins are unknown, but which are probably quite old, are 
to wedge, bat, grog, and saggar. Their monosyllabic forms would seem to 
indicate Anglo-Saxon roots, but no evidence exists to prove that one way or 
the other. Even the Oxford English Dictionary sheds no light on their 
derivation.

............
Marlin wrote (heavily snipped!)
don't know why the clay supply called it grog? maybe someone knows