The Collaborative International Dictionary
Supertuberation
Supertuberation \Su`per*tu`ber*a"tion\, n. [Pref. super- + tuber.] (Bot.) The production of young tubers, as potatoes, from the old while still growing.
Wiktionary
supertuberation
n. (context botany English) The production of young tubers from the old while still growing.