(baseball) A four-seam fastball

†Aphanapteryx bonasia, an extinct species of birds from the family Rallidae, formerly endemic to Mauritius.

(countable) A common species of fox, Vulpes vulpes native to North America, Asia, Europe and North Africa; small, with reddish fur, but larger than the arctic fox.

(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.