noun
(countable and uncountable) The colour of the setting sun, blood, and strawberries; the colour which is evoked by the longest visible wavelengths (between about 625–740 nm), and a primary additive colour.
(countable) A revolutionary socialist or (most commonly) a Communist; (usually capitalized) a Bolshevik, a supporter of the Bolsheviks in the Russian Civil War.
(countable, snooker) One of the 15 red balls used in snooker, distinguished from the colours.
(countable and uncountable) Red wine.
(countable) Any of several varieties of ale which are brewed with red or kilned malt, giving the beer a red colour.
(countable, informal) A red variety of an animal, such as a red kangaroo or a red squirrel.
(countable, informal, UK, birdwatching) A redshank.
(derogatory, offensive) An American Indian.
(slang) The drug secobarbital; a capsule of this drug.
(informal) A red light (a traffic signal)
(Ireland, UK, beverages, informal) Red lemonade
(particle physics) One of the three color charges for quarks.
(US, colloquial, uncountable) Chili con carne (usually in the phrase "bowl of red").
(informal) The redfish or red drum, Sciaenops ocellatus, a fish with reddish fins and scales.
(slang, uncountable) Tomato ketchup.
adjective
Of a red hue.
(of hair) Having an orange-brown or orange-blond colour; ginger.
(of the skin) Having a redder hue than usual due to embarrassment, anger, sunburn, etc.; flushed.
(of a dog or its coat) Having a brown color.
(card games, of a card) Of the hearts or diamonds suits. Compare black (“of the spades or clubs suits”)
(politics, often capitalized) Supportive of, related to, or dominated by a political party or movement represented by the color red:
(chiefly derogatory, offensive) Amerind; relating to Amerindians or First Nations.
(astronomy) Of the lower-frequency region of the (typically visible) part of the electromagnetic spectrum which is relevant in the specific observation.
(particle physics) Of a red color charge.
interjection
(BDSM, procedure word) Used to indicate that the speaker wishes current sexual activity to stop immediately.
verb
(archaic) simple past and past participle of rede
verb
Alternative spelling of redd.