Crossword-Solution: THIO 4 letters, 2 clues 🏆 scrabble score: 7

Among the substitution products of the phenols, the thio-, chloro-, bromo-, nitro-, and aminophenols as a rule yield tanning matters similar in character.

The principal states on the borders of the empire were, Germa'nia and Sarma'tia in Europe, Arme'nia and Par'thia in Asia, and Æthio'pia in Africa.

Placed in rough order of merit, the processes available are: Sulphide toning (hypo-alum toning is a cheaper, slower, and not quite so effective form of this method, whilst the thio processes represent sulphide toning at its best); copper toning; toning by re-development.

The prefixes furo-, thio, and pyrro-are used to distinguish three subclasses of azoles, which may be regarded as derived respectively from furfuran, thiophene, and pyrrol by replacement of the CH group by nitrogen; as, furo-monazole.

Etym: [Thio + ether + sulphine.] (Chem.) Defn: Any one of a series of complex basic sulphur compounds analogous to the sulphines.