picoline
/ˈpɪkəliːn/(also picolin) Chemistry
noun
Each of three colourless, pungent-smelling, liquid bases, (CH3)C5H4N, that are isomeric methyl derivatives of pyridine and are obtained from coal tar, bone oil, etc.; specifically the α-isomer (2-methylpyridine).
Origin
Mid 19th century. From classical Latin pic-, pix pitch + -ol + -ine. Compare German Picolin.