Main Entry: ac·cre·tion

Pronunciation: \ə-ˈkrē-shən\

Function: noun

Etymology: Latin accretion-, accretio, from accrescere — more at accrue

Date: 1615

1 : the process of growth or enlargement by a gradual buildup: as a : increase by external addition or accumulation (as by adhesion of external parts or particles) b : the increase of land by the action of natural forces
2 : a product of accretion; especially : an extraneous addition <accretions of grime>

— ac·cre·tion·ary \-shə-ˌner-ē, -ˌne-rē\ adjective

— ac·cre·tive \ə-ˈkrē-tiv\ adjective