NH₂C₆H₄OC₂H₅ Either of two toxic, oily liquids that darken when exposed to light and air; soluble in alcohol, insoluble in water; the ortho form boils at 228–230_C, is used to make dyes, and is also known at 2-aminophenetole; the para form boils at 253–255_C, is used to make dyes and in pharmaceuticals.