1785-95; < Latinflōrēsc(ēns) (present participle of flōrēscere to begin blooming, inchoative derivative of flōrēre to bloom, derivative of flōsflower) + -ence
C18: from New Latin flōrēscentia, from Latin flōrēscere to come into flower
Word Origin and History for florescence
n.
1793, from Modern Latin florescentia, from Latin florescentem (nominative florescens) "blooming," present participle of florescere "to begin to bloom," inceptive of florere "to blossom" (see flourish (v.)).