Definition of roccelline in US English:

roccelline

(also roccellin)

noun

Chemistry
  • A red azo dye used for wool and silk, made by coupling sulphonated azonaphthalene and β-naphthol. Now chiefly historical.

Origin

Mid 19th century (in an earlier sense). From scientific Latin Roccella + -ine.

Pronunciation

roccelline

/rɒkˈsɛliːn/