The Collaborative International Dictionary
Dealbation
Dealbation \De`al*ba"tion\, n. [L. dealbatio: cf. F. d['e]albation.] Act of bleaching; a whitening. [Obs.]
Wiktionary
dealbation
n. (context chemistry archaic English) The process or act of becoming or being made white, most commonly by bleaching; whitening.