Of or relating to accretion; concerning growth through external addition or accumulation of material.
From Latin 'accretio' (growth by addition) with the suffix '-al' (of or relating to), creating a technical adjective used primarily in geology and paleontology.
The difference between 'accretal' and 'accretionary' is subtle but important to geologists—'accretal' specifically emphasizes the addition process itself, while 'accretionary' describes the broader system of accumulation.
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