P / pĕr-ācer
adjective

pĕr-ācer

fem. pĕr-ācris · neut. pĕr-ācre
very sharp;
very sharp; trop.: judicium, Cic. Fam. 9, 16, 4 (but in Plaut. Bacch. 3, 3, 1, the correct reading is cor acre; v. Ritschl ad h. l.).