neutral red


: a basic dye used chiefly as a biological stain and acid-base indicator

Example Sentences

Recent Examples on the Web The white walls and the rooftop’s neutral red brick open wide possibilities for your preassembled dream team, but don’t be shy about asking for vendor suggestions, either. David Walters, The Cut, 13 Apr. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'neutral red.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Word History

First Known Use

1890, in the meaning defined above

Time Traveler
The first known use of neutral red was in 1890

Dictionary Entries Near neutral red

Cite this Entry

“Neutral red.” Dictionary, Merriam-Webster, Accessed 23 Mar. 2023.

Medical Definition

neutral red

: a basic phenazine dye used chiefly as a biological stain and acid-base indicator
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