alizarine yellow

noun, often capitalized A&Y

Definition of alizarine yellow

: any of various mordant dyes not related chemically to alizarin but applicable by similar methods: such as
a : a monoazo dye made by coupling diazotized m-nitroaniline with salicylic acid

called also Alizarine Yellow 2G

b : a monoazo dye made by coupling p-nitroaniline with salicylic acid and used chiefly as an acid-base indicator

called also Alizarine Yellow R

c : gallacetophenone

called also Alizarine Yellow C

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First Known Use of alizarine yellow

1893, in the meaning defined above

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