? Obs. [ad. L. aphronitrum, a. Gr. ἀφρόνιτρον, better ἀφρὸς νίτρου, spuma nitri.] ‘Foam of nitre’; a name formerly applied to the sulphur salts of various alkalis and earths.
1398. Trevisa, Barth. De P. R., XVI. lxix. (1495), 575. The fome of Nitrum hyghte Affronitum.
1601. Holland, Pliny (1634), II. 421. The Ægyptian Aphro-nitre or Salt-petre.
1751. Chambers, Cycl., s.v., Some modern naturalists rather take the antient Aphronitre to have been a native salt-petre.
