pantonern.
Probably a scribal error for pautener n.1 Cf. pantener n. and adj.
ΚΠ
a1500 (?c1450) Merlin 323 The x knyghtes..hadde taken mo than x pantoneres that alle weren espies of the kynge Rion.
a1500 (?c1450) Merlin 540 A knyght all naked in his breche..v pantoners dide bete with scorges that the blode ran down by his sides.
This entry has been updated (OED Third Edition, March 2005; most recently modified version published online September 2017).
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n.a1500