Penrose staircase see staircase illusion. [Lionel S. Penros...
Sorry, "hypoxanthine-guanine-phosphoribosyltransferase-hgprt" is not in the Dict...
oral–motor feeding problem a severe difficulty with sucking...
psychosomatic disorder a type of disorder in which psycholo...
iconicity n. an association between form and meaning in whi...
chemorepellant n. a chemical compound that repels particula...