ἀφρόνιτρον

A. native sodium carbonate (cf.νίτρον), distd. by Gal. 12.212 from the finer ἄνθος νίτρου, cf. Herod.Med. ap. Orib. 6.20.5: in Hp. and correct Greek divisim ἀφρὸς νίτρου: hence ἀφρόνιτρον is condemned by Phryn. 272.