oolong

oolong, oolong-tee A partially fermented tea which combines the characteristics of green tea and black tea.
1994, A. Varnam, ‎J. M. Sutherland, Beverages: Technology, Chemistry and Microbiology (page 187)

Flavour and aroma of semi-fermented teas is dictated by the extent of fermentation and, for this reason, oolong has a considerably stronger flavour than pouchong, which undergoes a significantly shorter fermentation.