disincrustantn.
Etymology: < dis- prefix 2e + Latin incrustānt-em, present participle of incrustāre to encrust v.: see -ant suffix1.Previous versions of the OED give the stress as: disinˈcrustant.
1878 R. Hunt & F. W. Rudler (ed. 7) IV. 1012 Zinc as a Disincrustant in Steam Boilers.
This entry has not yet been fully updated (first published 1896; most recently modified version published online June 2019).