Hello : Pline :
165 repertae sunt et in Italia aqua trahentes aciem acerrimae
effectu, nec non et trans Alpis, quas passernices vocant. quarta
ratio est saliva hominis proficientium in tonstrinarum officinis.
Laminitanae ex Hispania citeriore in eo genere praecipuae.
Passernices = oilstone/whetstone = celtic name ?
may be from Kw-asto- = cough
whetstone > to scrape > cough ?
or Pokorny
Pasto- = solide
http://www.indo-european.nl/cgi-bin/startq.cgi?
flags=endnnnl&root=leiden&basename=%5Cdata%5Cie%5Cpokorny
Root / lemma: pasto-
English meaning: solid
German meaning: `fest'
Material: Ai. pastya´-m `Wohnsitz'; arm. hast (i-St. ) `fest'; aisl.
fastr, ags. f?st, as. fast, ahd. festi, nhd. fest.
References: WP. II 7 f.
Page(s): 789