pyroligneous acid
noun
py·ro·lig·ne·ous acid ˌpī-rō-ˈlig-nē-əs- 
: an acid reddish-brown aqueous liquid containing chiefly acetic acid, methanol, wood oils, and tars that is obtained by destructive distillation of wood
Word History
Etymology
French pyroligneux, from pyr- + ligneux woody, from Latin lignosus, from lignum wood — more at ligneous
First Known Use
1788, in the meaning defined above