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countable and uncountable, plural oolongs
A partially fermented tea, often roasted, which combines the characteristics of green tea and black tea. quotations examples
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.
1994, A. Varnam, J. M. Sutherland, Beverages: Technology, Chemistry and Microbiology, page 187