Etymology
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adenine (n.)

crystalline base, 1885, coined by German physiologist/chemist Albrecht Kossel from Greek adēn "gland," from PIE root *engw- "internal organ" (see inguinal) + chemical suffix -ine (2). So called because it was derived from the pancreas of an ox.

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Definitions of adenine

adenine (n.)
(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA;
Synonyms: a
From wordnet.princeton.edu