This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Simple past tense and past participle of pith.

"The frog was not dead, but its brain had been pithed, which is what happens when you stick a probe into the skull and wiggle."

pithed    pithing    piths   

plant tissue    remove    get rid of   

energy    essence    force    discoid pith   

pith helmet   

vigor    strength    importance    decerebrize   

Blyth    Fifth    Smith    Smyth    fifth    forthwith    frith    herewith    myth    scythe   

pulp    terseness