Definition of "Accretion" :

noun: (law) an increase in a beneficiary's share in an estate (as when a co-beneficiary dies or fails to meet some condition or rejects the inheritance)

noun: an increase by natural growth or addition

noun: (geology) an increase in land resulting from alluvial deposits or waterborne sediment

noun: (biology) growth by addition as by the adhesion of parts or particles

noun: (astronomy) the formation of a celestial object by the effect of gravity pulling together surrounding objects and gases

noun: something contributing to growth or increase

"He scraped away the accretions of paint."