See Also: vacuum tube(medicine)
vacuum tube(encyclopedia)
vacuum tube(dictionary)
Breathing Tube (endotracheal tube)(health)
Vacuum(medicine)
vacuum(encyclopedia)
vacuum(dictionary)
vacuum pan(medicine)
vacuum 2, verb(dictionary)
vacuum flask(dictionary)

wardite (iou) and vacuum tube (medicine)


wardite (iou)



wardite noun. L19.
[from H. A. Ward (1834-1906), US naturalist and dealer + -ITE1.]
Mineralogy. A hydrated basic tetragonal phosphate of sodium and aluminium, occurring as transparent light blue-green crystals.

vacuum tube (medicine)


vacuum tube


A glass tube from which the air has been removed, containing two or more electrodes, between which passes an electrical current or spark; used in the production of X-rays, or to control circuits. Previously in wide use, the vacuum tube has been supplanted by transistors in electronic circuits.