Pali "pavana" as an adjective?

Mason reports that there is an adjective form of the root "pu" (as in
"pu.naati", i.e., "he cleans") spelled "pavana".  The meaning of this
adjective form of "pavana" is said to be "pure".  This seems to me to be
plausible, but this is not related to the dictionary meaning for "pavana" as
a noun.

Any opinions would be appreciated.

E.M.

--
A saying of the Buddha from http://metta.lk/
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Knowing that this body is like foam, and comprehending its mirage-nature,
one should destroy the flowershafts of sensual passions (Mara), and pass
beyond the sight of the King of Death.
Random Dhammapada Verse 46