An Etymological Dictionary of Astronomy and Astrophysics

Geometry: The regular solid whose faces are six squares.
Algebra: The third power of a quantity; the product of three equal factors (a . a . a = a³).

Etymology (EN): From L. cubus, from Gk. kubos “a cube, a die; cavity before the hip,”
kubiton “elbow;” cf. Skt. kubra- “hole in the earth, pit;” Goth. hups “hip;” from PIE base *keu- “to bend.”

Etymology (PE): The currently used term in Pers. is moka’ab (مکعب), loan from Ar., from ka’b (کعب)
“talus, anklebone, heel; die.” There are several Pers. equivalents for the concepts “talus, anklebone; die,” one of which qâb, variants qâp and
in Tabari kâb “heel, talus.” This dictionary adopts kâb, which has already been introduced by other sources.