Tubulær

Tubulær is an adjective used to describe something that is tube-shaped or composed of tubes. It is commonly used in biology and medicine to denote a hollow, cylindrical structure with a lumen. The term derives from the Latin tubulus meaning small tube; cognate forms appear in many languages, such as tubular in English and tubulaire in French, with tubulær as the standard form in Norwegian and Danish.

In anatomy and physiology, tubulær describes structures such as renal tubules, which process filtrate in the kidney, tubular glands, and the cylindrical shafts of long bones. In botany, tubulær refers to plant organs that are elongated and hollow, for example a tubulær corolla that forms a tube. In zoology and histology, it is used for tubular epithelia and ducts, such as Malpighian tubules in insects or other tubular excretory passages. In materials science, tubulær describes hollow, cylindrical components like tubes, fibers, or nanotubes when used descriptively.

The term remains primarily descriptive rather than designating a single anatomical entity. Related forms include tubule (a small tube) and tubulus, as well as the English adjective tubular and the French tubulaire.