Added 9 October 2026 cuboid /ˈkjuːbɔɪd/ noun Categories: Describing WordsRare Words noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about cuboid at Wordnik → Where our words come from → A rectangular parallelepiped. adjective Shaped like a cube. Related Words: cubicalcubiformcuboidalcubelikethree-dimensionalcubiccube-shapedcalcaneocubeycubitalcubickcuneocuboid Back to today's word