Used other than figuratively or idiomatically: be sick. / (informal) To vomit.

plural of Sick

A surname from German.

(UK, colloquial) In receipt of any of various current or former sickness, disability or incapacity benefits

Alternative spelling of carsickness

especially, African sleeping sickness, an endemic infectious disease of humans and animals in tropical Africa, caused by a parasitic trypanosome, transmitted by the tsetse fly and characterized by fever, severe headache, joint pains and lymph node swelling in the early stages, followed by a neurological phase of extreme weakness, sleepiness, and deep coma leading to death

(pathology) A sometimes fatal condition resulting from the formation of nitrogen bubbles in the blood and tissues, because of too rapid decompression, seen especially in deep-sea divers ascending rapidly from a dive. It is characterized by severe pains in the joints and chest, skin irritation, cramps, nausea, and paralysis.

(medicine, pathology) Any illness produced by ionizing radiation with symptoms ranging from nausea to death.

A feeling of nausea or dizziness caused by a disagreement between visually perceived movement and the vestibular system's sense of movement; typically resulting from travel in a vehicle such as a ship or car.

A disease characterised by a greenish tint to the skin; chlorosis. / The abnormal appetite associated with such a disease; pica.