py·ro·lig·ne·ous acid | \ ˌpī-rō-ˈlig-nē-əs- 
\
\Definition of pyroligneous acid
: an acid reddish-brown aqueous liquid containing chiefly acetic acid, methanol, wood oils, and tars that is obtained by destructive distillation of wood
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Time Traveler for pyroligneous acid
The first known use of pyroligneous acid was in 1788
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