I. noun
Usage: usually capitalized R&C
: a red Greek cross on a white ground adopted by the Geneva convention of 1864 as the emblem to identify noncombat installations, vehicles, and personnel ministering to the sick and wounded in war and now used as the emblem of the International Red Cross and its affiliates not only in war but in disaster relief and other humanitarian services — called also Geneva cross
II. adjective
Usage: usually capitalized R&C
Etymology: from the Red Cross, an international humanitarian organization
: of or relating to the International Red Cross or its affiliates — compare red crescent