cúbica

Cúbica is the feminine form of the adjective cúbico in Spanish and Portuguese. It denotes relation to a cube or to quantities raised to the third power. The root comes from Latin cubicus, itself derived from cubus (cube).

In geometry and crystallography, cúbica describes cubic shapes, symmetry, or systems. For example, sistema cúbico refers to crystals with cubic symmetry, and forma cúbica can describe cube-like shapes. In everyday language, the noun for the geometric shape is cubo (cube), while cúbica is used as a descriptive term.

In algebra and calculus, cúbica is used to characterize objects of degree three. Expressions such as ecuación cúbica, polinomio cúbico y función cúbica denote a cubic equation, a cubic polynomial, and a cubic function, respectively. A typical example is f(x) = ax^3 + bx^2 + cx + d, where the highest power of x is three.

In metrology and science, cúbica appears in the context of volume and measurement. The phrase volumen cúbico describes volume expressed in cubic units; the standard SI unit is metro cúbico (m^3).

Usage notes: cúbica agrees in gender with the noun it modifies; the masculine form is cúbico. The term is widely used in both Spanish and Portuguese to denote cubic properties, cubic equations, and cubic measurements.