cubical cu·bi·cal UK/ˈkjuːbɪkəl/ US/ˈkjubɪkəl/ uncommon adjective 1. shaped like a cube Synonymscubelikecube-shapedcubiformcuboidcuboidal Similarcubic WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.