(informal, often humorous) The referent of it is dangerous or undesirable and should be eliminated.

plural of orange-footed scrubfowl

A species of megapode, Megapodius reinwardt, of Indonesia, New Guinea, and northern Australia.

an azo dye, used for dyeing wool

(entomology) A species of satyrine butterfly with orange wings, Hypocysta adiante, endemic to northern Australia.

plural of orange ringlet

A hue of orange used to set objects apart from their surroundings, particularly in complementary contrast to the azure color of the sky; commonly used in the US for traffic cones and other construction zone marking.

plural of orbital element

(astronomy) One of the parameters needed to uniquely specify a particular orbit.

plural of p-adic order