Definition: Psicosis - a mental illness characterized by intense anxiety, fear, or panic attacks that often lead to suicidal thoughts. Definition: Psoriasis - also known as psoriatic arthritis, is an autoimmune disorder that causes inflammation in skin tissue. It typically affects the body's largest and most sensitive areas like the joints of the hand and feet, causing redness, swelling, and pain. Psycsia - a term describing someone who possesses or displays certain mental traits, skills, or abilities beyond normal human capabilities.