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