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phylactic

[fi-lak-tik]
adjective
  1. defending or protecting, especially from disease.
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Origin of phylactic

1700–10; < Greek phylaktikós preservative, equivalent to phylakt(ós) guarding (verbid of phylássein to guard) + -ikos -ic. See prophylactic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018