Etymology
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zoster (n.)

kind of seaweed, c. 1600, Latin, from Greek zōstēr "girdle," originally "warrior's belt," from zōnnynai (see zone (n.)). Meaning "shingles" is from 1706; in the literal sense, "a belt or girdle, especially for men," from 1824.

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Definitions of zoster

zoster (n.)
eruptions along a nerve path often accompanied by severe neuralgia;
Synonyms: herpes zoster / shingles
From wordnet.princeton.edu