(hematology, cytology) A type of cell in the blood of vertebrates that contains haemoglobin and transports oxygen from the lungs to the tissues; a red blood cell.

plural of red corpuscle

(chiefly Southern US) An earthworm.

A glycoside obtained from beets and used as a food dye, also known as betanin and E162.

(cytology) An erythrocyte (red blood cell).

(Internet, Wiktionary and WMF jargon) A red hyperlink that directs to a nonexistent page of a wiki.

(American football) The area extending twenty yards from the end zone, where a team in possession of the ball is expected to score.

Alternative spelling of blood red

(marketing) A week that is in high demand because it is in a holiday high season. Especially used in time-share, but not limited to this industry.

(idiomatic, aviation, military) A hotshot fighter pilot; an ace fighter pilot.