planctu

planctu is a Latin form of plango, meaning “beat (the breast in grief); lament, bewail”. It is the supine dative singular neuter.

Found 30 times in the Latin texts on Socratos.

Where it is used

Seneca the Younger, Hercules Furens 1114: uno planctu tria regna sonent.

All forms of plango (conjugation table)

Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.