What does cubica mean?
In historical mathematical English, cubica was a noun meaning the cube root of a number. The expression is now obsolete or archaic, and modern speakers generally use cube root instead. Historically, however, it provided a compact terminology for algebraic calculation, appearing in discussions of powers, equations, and the extraction of roots. The word belongs to learned mathematical Latin usage rather than everyday vocabulary, and its survival is chiefly archival. Its form can be misleading today because the superficially similar modern adjective cubic has a quite different grammatical function. A reader encountering cubica in an old mathematical text should therefore understand it as “the third root”: for example, the cubica of 27 is 3. Although the modern term cube root is preferable in current usage, cubica offers a useful glimpse into the Latin-derived vocabulary that shaped English mathematical terminology.
nounAn obsolete mathematical noun denoting the cube root of a number. In modern English, the usual term is “cube root.”
- Obsolete mathematics: the cube root of a number.
"The pupil was asked to extract the cubica of 125."
"The pupil was asked to extract the cubica of 125."
"In an early treatise on algebra, the author set out a method for finding the cubica of a given number."
The plural form is rare and occurs chiefly in mathematical contexts.
"The exercises asked for the cubicas of several perfect cubes."
Before “cube root” became standard, English mathematicians could simply call it the cubica.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does cubica come from?
The English noun comes through Latin mathematical usage, especially the phrase radix cubica, literally “cubic root.” In that phrase, cubica is the feminine singular form of the Latin adjective cubicus, agreeing with radix, meaning “root,” while cubicus derives from cubus, meaning “cube.” Its English sense reflects the shortened adjectival form being used independently for “cube root.”
How cubica is actually used
This is an archaic, specialized mathematical term confined largely to historical writing. Modern standard English uses “cube root” in educational, scientific, and general contexts.
Easily confused with cubica
Cubica was an archaic noun for the cube root of a number, whereas cubic is a modern adjective meaning cube-shaped or relating to the cube.