ziehl-neelsenhttp://www.oed.com/dictionary/ziehl-neelsen_n%3Ftab%3Dmeaning_and_useZiehl-Neelsen, n.
First published 1986; not fully revised

Ziehl-Neelsennoun

Bacteriology.
  1. 1892–
    Applied to a method for identifying acid-fast organisms such as tubercle bacilli by staining with Ziehl's stain, decolorizing with sulfuric acid (and sometimes also alcohol), and counterstaining with methylene blue: acid-fast organisms retain the original red colour.
    1. 1892
      The Ziehl-Neelson [sic] method.
      G. M. Sternberg, Manual of Bacteriology i. iv. 30 (heading)
    2. 1974
      Mycobacterium..tuberculosis..stained by the Ziehl-Neelsen method is acid-fast and alcohol-fast.
      R. M. Kirk et al., Surgery ii. 21

Originally published as part of the entry for Ziehl, n.

Ziehl, n. was first published in 1986; not fully revised.