A tube with a constriction, utilizing venturi effect e.g. to measure the velocity or volume of a fluid flow.

(slang) A marijuana cigarette.

A locomotor appendage of an echinoderm consisting of a tube with longitudinal muscles, pressurized by water.

Alternative form of down the tubes

A tubule that extends from the alimentary canal to the exterior of the organism, excreting water and wastes in the form of solid nitrogenous compounds. Found in certain insects, arachnids, myriapods and tardigrades.

plural of test tube baby

Resembling or characteristic of a tuba.

An early experimental electrical discharge tube by means of which cathode rays and X-rays were discovered.

plural of tube top

(surgery) salpingectomy