Sorry, "natural-killer-cell-nk-cell" is not in the Dictionary of Psychology. Ple...
lethargy n. low energy level and lack of motivated behavior...
refutation n. in logic and philosophy, the act or process o...
psychiatric disability chronic loss or impairment of functi...
papilla n. (pl. papillae) any of the four types...
paroxysmal sleep see narcolepsy.