† incanescencen.
Etymology: formed as incanescent adj.   + -ence suffix.
 Obsolete. 
rare. Apparently only attested in dictionaries or glossaries.
1656    T. Blount   				Incanescence, a waxing hoary or white headed.
1658    in  E. Phillips   				
 This entry has not yet been fully updated (first published 1900; most recently modified version published online June 2021).