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Actinomycetaceae

(ăk′tə-nō-mī′sĭ-tāsē-ē′)
n.
  1. A family of non-spore-producing, nonmotile, mostly facultatively anaerobic bacteria containing gram-positive, non-acid-fast, predominantly diphtheroid cells that tend to form branched filaments.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.