accrementition
/ˌakrɪmənˈtɪʃn/Biology rare
noun
Organic growth in which the new substance is exactly like that from which it proceeds; (more widely) accretion.
Origin
Late 19th century; earliest use found in The New Sydenham Society's Lexicon of Medicine and the Allied Sciences. From classical Latin accrēmentum addition + -ition, after either French accrémentition or German Accrementition.