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.
butâ¢ton. 1. a small disk, knob, or the like attached to an article, as of clothing, and serving as a fastener when passed through a buttonhole or loop. 2. anything resembling a button, esp. in being small and round, as a candy, ornament, or marker. 3. a badge or emblem bearing a name, slogan, or the like, for wear on the lapel, dress, etc.: campaign buttons. 4. a small knob or disk pressed to activate an electric circuit, operate a machine, open a door, etc. 5.