赤

red-legged partridge (Alectoris rufa)

red cornetfish (Fistularia petimba)

red wattlebird (Anthochaera carunculata)

Okinawan yellow cucumber

dusky batfish (Platax pinnatus)

type of taro originally from Sulawesi, has large tubers with red eyes

Food, cooking

reed tripe; beef abomasum

infrared radiation

bullfinch (Pyrrhula pyrrhula rosacea)

red carrageen (Chondrus crispus); red carragheen; red Irish moss

red jungle fowl (Gallus gallus)

red tonguesole (Cynoglossus joyneri)

cuprite; red copper; red copper ore

Physiology

haemagglutination; hemagglutination

erythroblast

red clay

Gymnosporangium rust (plant infection)

Red Brigades

infrared lamp

infrared therapy

loss-making business; company operating in the red

Neurospora crassa (species of red bread mould)

hair tied with red yak's tail hair

Astronomy

axial tilt; obliquity