crucium

Meaning

1. Old Latinaccusativeneuternominativesingularbad, cross (of wine)
   Crucium, quod cruciat. Unde Lucilius vinum insuave crucium dixit.Crucius, that which hurts, whence Lucilius calls crucium bad wine.1839 [8th century CE], Paulus Diaconus, edited by Karl Otfried Müller, Excerpta ex libris Pompeii Festi De significatione verborum, page 53:

Origins

Back-formation from cruciō (“to torture, hurt, cause pain”), though this is not a common procedure in Latin.