Definition of xanthoxylin
plural -s
1 a
: a crystalline phenolic ketone C10H12O4 obtained from seeds of a shrubby Chinese tree (Zanthoxylum piperitum)
b
: any of several crystalline compounds obtained from the bark of other trees of the genus Zanthoxylum;
especially
: xanthoxyletin
2
or
xanthoxylin extract
: a purified alcoholic extract of prickly-ash bark
