A cubic curve.
"The mathematician spent years analyzing the properties of a cubic curve to understand its complex intersections."
having the shape of a cube; having three dimensions
"The room had cubic dimensions, making it perfectly square in both length and width."
Used in the names of units of volume formed by multiplying a unit of length by itself twice.
"The cubic meter is defined as the volume of a cube whose edges are each one meter long."
In plain English: Cubic describes something shaped like a cube, having six square sides of equal length that meet at right angles.
"The room was filled with cubic boxes stacked from floor to ceiling."
Usage: Use "cubic" to describe three-dimensional measurements like cubic meters or cubic feet, distinguishing them from two-dimensional square units. It specifically refers to volumes calculated by cubing a linear dimension rather than describing shape alone.
The word cubic comes from Middle French, where it was formed by combining the word cube with the suffix -ic. It originally meant "related to a cube."