Red Indian

Amerindian

bluefin tuna

(sports) red card

(cytology) red blood cell

red mud

(astronomy) red giant (star)

(literally) red lantern / (specifically) red lantern at the rear of a train / (chiefly sports) Lanterne rouge, the competitor in last place in a competition; the person or entity at the bottom of a ranking / (chiefly sports, originally cycling) Lanterne rouge, last place in a competition or other ranking

(historical) a French revolutionary during the French Revolution / (historical, by extension) any revolutionary

(cycling) a red flag indicating to riders that the finish line is coming up in one kilometre