produced in a test tube / conceived or developed in vitro by artificial insemination

(anatomy) In humans and other land vertebrates, a tube that links the nasopharynx to the cavity of the middle ear to allow the equalization of the pressure on both sides of the eardrum.

the tube that develops from the wall of a pollen grain and, in seed plants, provides a passage through which the male nuclei reach the embryo sac to effect fertilization

a photoelectric device for intensifying faint astronomical images

A device in some early internal combustion engines that ignited the fuel/air mixture in a tube heated by a flame

An inflatable rubber tube inserted into the casing of a pneumatic tyre/tire.

A phototube in which an electric current flows when a certain illumination is reached; used as a relay

(electronics) A type of electron tube that controls electron current through vacuum between electrodes within a sealed container, usually of glass or metal and often designed to be easily installed in and removed from the equipment in which it is used.

(physics) Any of several electronic devices that control electron current through vacuum, gas or vapor between electrodes within a sealed container, usually of glass or metal and often designed to be easily installed in and removed from the equipment in which it is used.

Alternative letter-case form of Fallopian tube