accretion
Concise Oxford English Dictionary © 2008 Oxford University Press:
accrete /əˈkriːt/
▶verb grow or form by accumulation or coalescence.
– derivatives
accretion noun,
accretionary adjective,
accretive adjective.
accretion noun,
accretionary adjective,
accretive adjective.
– origin C18 (earlier (C17) as accretion): from L. accret-, accrescere ‘grow’, from ad- ‘to’ + crescere ‘grow’.
'accretion' also found in these Oxford entries:

