tumorigenesis
tu mor i gen e sis |ˌt (y )o͞omərəˈjenəsis ˌtjumərəˈʤɛnəsəs | ▶noun the production or formation of a tumor or tumors.
tumorigenesis |ˌtjuːmərɪˈdʒɛnɪsɪs | ▶noun [ mass noun ] the production or formation of a tumour or tumours.
The Wordsmith Dictionary
The Wordsmith Dictionary