Wiktionary
n. (context organic compound English) The cationic form of a polycyclic aromatic base, ''name 3,8-Diamino-5-ethyl-6-phenylphenanthridinium'', whose bromide is used as a stain for nucleic acids
Wikipedia
Usage examples of "ethidium".
She preferred the faster and more stable ethidium bromide, even though you needed an ultraviolet trans illuminator to make it fluoresce.
In this way, by successive doublings, they managed to evolve a strain of RNA that could self-replicate in very high concentrations of ethidium bromide, 10 times as concentrated as the poison that had inhibited the original ancestral V2 RNA.
He seldom washed lab glassware and twice had been accused of not wiping up spills of ethidium bromide -- a strong mutagen -- on lab counters.
Somebody got agarose and ethidium bromide all over the workbench and on the floor and didn’.