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.
Soft key. Softkeys on a push-button telephone, allowing 'Redial', 'New Call', and 'CFwdALL'. A softkey or soft key is a button flexibly programmable to invoke any of a number of functions rather than being associated with a single fixed function or a fixed set of functions. A softkey is often located alongside a display device of a portable device such as a cellular phone, where the button invokes a function described by the text at that moment shown adjacent to the button on the display.