Definition of paca
: either of two large nocturnal chiefly Central and South American rodents (Agouti paca synonym Cuniculus paca and A. taczanowskii synonym C. taczanowskii) that typically have a white-spotted brownish coat
Seen and Heard
What made you want to look up paca? Please tell us where you read or heard it (including the quote, if possible).