Etymology
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tetracycline (n.)

1952, with chemical suffix -ine (2) + tetracyclic "containing four fused hydrocarbon rings," from tetra- "four" + cyclic.

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Definitions of tetracycline

tetracycline (n.)
an antibiotic (trade name Achromycin) derived from microorganisms of the genus Streptomyces and used broadly to treat infections;
Synonyms: Achromycin
From wordnet.princeton.edu