alizarine yellow

noun

often capitalized A&Y

: 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

Word History

First Known Use

1893, in the meaning defined above

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