"an incrustation; an act of crusting over," 1650s, noun of action or state from crust (v.).
Entries linking to crustation
crust v.
late 14c., "to thicken or contract into a hard covering" (intransitive); see crust (n.). From 1540s in transitive sense of "cover with a crust or hard exterior portion." Related: Crusted; crusting.