Of, pertaining to, or in the form of an accretion(adjective)
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Use "accretionary" in a sentence
"Accretionary wedges (also known as accretionary complexes or accretionary prisms) are essentially compressional fold-thrust belts composed primarily of oceanic sediment and, in many cases, continentally-derived sediment from the nearby continental plate."
"About, the accretionary abuse and automatic head evolution rejected its similar sea into the high filter."
"Accretionary lapilli are formed in an eruption column or cloud by moisture or electrostatic forces, with the volcanic ash nucleating on some object and then accreting to it in layers before the accretionary lapillus falls from the cloud."