theine

American  

[thee-een, -in] / ˈθi in, -ɪn /

noun

1. caffeine, especially in tea.

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theine British  

/ ˈθiːiːn, -ɪn /

noun

1. another name for caffeine, esp when present in tea

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Etymology

Origin of theine

First recorded in 1830–40; from New Latin the(a) “tea” ( see origin at tea) + -ine ²

Example Sentences

It is remarkable also that tea has been found to contain an element called theine, which has the same quantity of nitrogen.

From Popular Books on Natural Science For Practical Use in Every Household, for Readers of All Classes by Bernstein, Aaron David

It belongs to the holly family, but contains a bitter principle similar to, if not identical with, theine, or the alkaloid found in tea and coffee.”

From The Western World Picturesque Sketches of Nature and Natural History in North and South America by Kingston, William Henry Giles

It contains the same active principle, theine as tea and coffee, but not their volatile and empyreumatic oils.

From Catalogue of Economic Plants in the Collection of the U. S. Department of Agriculture by Saunders, William

Its active principle is identical with theine, of which it contains a larger quantity than exists in any other known plant, being more than double that contained in the best black tea.

From Catalogue of Economic Plants in the Collection of the U. S. Department of Agriculture by Saunders, William

Now this quantity is contained in 0.6 parts of theine, or 2 grains 8/10ths of theine can give to an ounce of bile the nitrogen it contains in the form of taurine.

From The Commercial Products of the Vegetable Kingdom Considered in Their Various Uses to Man and in Their Relation to the Arts and Manufactures; Forming a Practical Treatise & Handbook of Reference for the Colonist, Manufacturer, Merchant, and Consumer, on the Cultivation, Preparation for Shipment, and Commercial Value, &c. of the Various Substances Obtained From Trees and Plants, Entering into the Husbandry of Tropical and Sub-tropical Regions, &c. by Simmonds, P. L.