noun, masculine/paʁ.pɛ̃/plural: parpaings
perpend stone, through stone; breeze-block (building block)
“Mon père était tellement de gauche que quand est tombé le mur de Berlin Il est parti chez Casto pour acheter des parpaings” — My father was so left-wing, that when the Berlin Wall fell He went to Castorama to buy some perpends
Probably from Vulgar Latin *perpetaneus, from Latin perpes (“uninterrupted”), or from a root *perpedaneum, from pes (“foot”) (cf. pedaneus).