Vitamin A deficiency: Related Medical Conditions. To research the causes of Vitamin A deficiency, consider researching the causes of these these diseases that may be similar, or associated with Vitamin A deficiency:
Definition of push button. : a small button or knob that when pushed operates something especially by closing an electric circuit.
push verb (USE PRESSURE) 1  A2 [ I or T ] to use physical pressure or force, especially with your hands, in order to move something into a different position, usually one that is further away from you: