kubli -kub- gismu

x1 is a cube/regular polyhedron/polygon of dimensions x2 (def. 3), surfaces/sides x3 (def. 6).

(cf. kurfa - needed for 'cube', bliku for a physical object; tanbo, tapla, tarmi)

In notes:

bliku
x1 is a block [3-dimensional shape/form] of material x2, surfaces/sides x3.
kurfa
x1 is a right-angled shape/form defined by set of vertices x2, dimensions x3 (default 2).
tanbo
x1 is a board/plank [3-dimensional long flat rectangle] of material x2.
tapla
x1 is a tile/cake [shape/form] of material x2, shape x3, thickness x4.
tarmi
x1 [ideal] is the conceptual shape/form of object/abstraction/manifestation x2 (object/abstract).
blikubli
k1=b1 is a regular polyhedron [3 dimensional] with sides/surfaces k3=b3.
caltaicmaci
cm1 is a geometry describing cm2=ca1=t1 geometric object.
kelkubli
ku1 is a die/are dice for game x2 with surfaces/sides ku3 (default 6).
kubybli
b1=k1 is a regular polyhedron [3-dimensional] consisting of material b2 with surfaces/sides b3=k3.
kubyko'u
x1 is a pyramid of materal x2 with vertex x3
terkubli
x1 is an x4 (def. x2-1)-dimensional side of x2-dimensional polyhedron x3; x1 is an edge when x4=1; x1 is a vertex when x4=0.
clafi
x1 is a regular polyhedra/polygon/polytope with the Schläfli symbol {x2, x3, x4, …}