Accretion
1. Increase by addition to the periphery of material of the same nature as that already present; e.g., the manner of growth of crystals.
Synonym: accrementition.
2. In dentistry, foreign material (usually plaque or calculus) collecting on the surface of a tooth or in a cavity.
3. A growing together.
Origin: L. Accretio, fr. Ad, to, – crescere, to grow
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