accremental

adjective1

1. •
   Related to growth or increase by successive additions, particularly in size or volume, often through the gradual deposition of material. This term is used to describe processes or structures that grow by accretion, such as the formation of shells, tree rings, or the buildup of biological tissues.

   • There are moderately developed accremental striae, which become ruder and rounder on the free tube. — 1904