cilindricas

Cilindricas is the plural feminine form of the adjective meaning "cylindrical" in several Romance languages, used to describe objects, surfaces or features that approximate the geometry of a cylinder. In geometry, a cylinder is a three-dimensional solid with two parallel, congruent circular bases connected by a curved lateral surface. Common variants include right cylinders (axis perpendicular to the bases) and oblique cylinders (axis at an angle), as well as cylindrical surfaces formed by parallel translation of a circle.

Key geometric properties for a circular right cylinder of radius r and height h include volume V = πr^2h and surface area A_total = 2πr(h + r), with lateral area A_lateral = 2πrh. Cylindrical shapes also extend to noncircular cross sections, such as elliptical cylinders, and to generalized cylindrical surfaces in differential geometry.

Cylindrical forms are ubiquitous in engineering, manufacturing and everyday objects: pipes, tanks, rollers, columns and container bodies often use cylindrical geometry for structural efficiency, ease of fabrication and fluid flow characteristics. In nature, elongated stems, some bones and certain shells exhibit approximately cylindrical shapes. Manufacturing methods include turning on lathes, extrusion, rolling and molding.

The term derives from Greek and Latin roots related to "cylinder" and is used descriptively in technical, architectural and colloquial contexts to indicate symmetry around a central axis.