one-step: an early ballroom dance; precursor to the fox-trot
ballroom dancing: any of a variety of social dances performed by couples in a ballroom
infliximab: an anti-TNF compound (trade name Remicade) consisting of an antibody directed against TNF; it is given intravenously at one-month to three-month intervals; used in treatment of regional enteritis and rheumatoid arthritis