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uncountable
(organic chemistry) Caffeine when present in tea. quotations examples
Caffeine is called guaranine when found in guarana, mateine when found in mate and theine when found in tea. There is far more caffeine in coffees than in teas.
2010, Crispian Scully, Medical Problems in Dentistry E-Book, Elsevier Health Sciences, page 693
plural theines
Obsolete form of thane. examples