1. [adj]  having or showing vigorous vegetal or animal life; "flourishing crops"; "flourishing chicks"; "a growing boy"; "fast-growing weeds"; "a thriving deer population"
2. [adj]  very lively and profitable; "flourishing businesses"; "a palmy time for stockbrokers"; "a prosperous new business"; "doing a roaring trade"; "a thriving tourist center"; "did a thriving business in orchids"

THRIVING is a 8 letter word that starts with T.