Accretion

noun/uh-KREE-shuhn/

Meaning

A slow growth or build-up caused by adding layer upon layer.

In context
An accretion of dust had gathered on the old trophies in the cabinet.

Remember it

Accretion shares roots with 'increase'; it is growth that creeps up bit by bit.

Use it well

Use for gradual layering or build-up, common in science texts about rocks, reefs or ice.