Pȳ-rŏx'y-līne, n.

n. [Gr. πῦρ, πυρός, fire, and ξύλον, wood; Fr. pyroxyle.] (Chem.) An explosive substance obtained by immersing vegetable fiber in nitric and sulphuric acid, or in a mixture of nitric and sulphuric acids, and then suffering it to dry; gun-cotton. Dana.