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.
Authors may create three types of buttons: 1  submit buttons: When activated, a submit button submits a form. 2  reset buttons: When activated, a reset button resets all controls to their initial values. 3  push buttons: Push buttons have no default behavior.