Definition of incrustations:
(n) :
A crust or hard coating of anything upon or within a body, as a deposit of lime, sediment, etc., from water on the inner surface of a steam boiler.
(n) :
The act of incrusting, or the state of being incrusted.
(n) :
A covering or inlaying of marble, mosaic, etc., attached to the masonry by cramp irons or cement.
(n) :
Anything inlaid or embedded.
(n) :
(figuratively) An accumulated characteristic of a person that disguises their true nature.