(chemistry) A stable allotrope of phosphorus; used in the manufacture of safety matches, pesticides etc.

A collection of cells in the tegmentum involved in movement. / Specifically, the title nucleus involved in the rubrospinal movement pathway.

(astronomy) A small, relatively cool star of the main sequence; most stars in the Milky Way are red dwarfs.

A red-colored, ripe, bell or sweet pepper. Unripe peppers of this variety are green and edible but not as sweet. / (US) Spicy pepper.

A dish of rice made with tomatoes, soul food from South Carolina.

Canis rufus, a medium-sized canine native to the southeastern United States.

(idiomatic) To become enraged, angry, or irritated. / (idiomatic, soccer) To receive a red card, and be dismissed from the playing field.

(figuratively) A cue, warning, or alert; a sign or signal that something is wrong. / (idiomatic, US) red rag

A clay-like material, containing ferric oxide, used as a pigment.

Used other than figuratively or idiomatically: see red, mist. / (idiomatic) uncontrollable rage, anger sufficient to stop clear thinking.