|asə(ˌ)tōvəˈniˌlōn, əˌsēd.ō-, -ˈvan ə lˌōn noun
( -s )
Etymology: International Scientific Vocabulary acet- + vanill in + -one
: a crystalline ketone C 9 H 10 O 3 formed as a by-product in the commercial synthesis of vanillin from lignin; 3-methoxy-4-hydroxy-acetophenone — called also apocynin