Definition of pedunculation in US English:

pedunculation

noun

Medicine Zoology
  • The formation of a peduncle, especially by a tumour; the condition of being pedunculate.

Origin

Mid 19th century. From pedunculate + -ion; compare -ation.

Pronunciation

pedunculation

/pɪˌdʌŋkjʊˈleɪʃn/