This form may be read as tosté (see
toster). More likely, this adjectival form derives directly from Latin tostus (see FEW
tostus), and has the same etymon as
tost2.
a.
1dry, parched:
(
c.1240; MS: s.xiii3/4
)
Si la mamele est dure e toste (ed. tosté) e luisante, si la lessiez ester
i 78.XXVIII
tost1 (c.1240)