*halen*

n. A genus of herbs of Eurasia and the Americas: spurred gentians.
Syn. -- genus Halenia. [ WordNet 1.5 ]

a. Used for inhaling; as, the inhalent end of a duct. Dana. [ 1913 Webster ]

n. (Chem.) A white crystalline aromatic hydrocarbon, C10H8, analogous to benzene, and obtained by the distillation of certain bituminous materials, such as the heavy oil of coal tar. It is the type and basis of a large number of derivatives among organic compounds. Formerly called also naphthaline. [ 1913 Webster ]

Naphthalene red (Chem.), a dyestuff obtained from certain diazo derivatives of naphthylamine, and called also magdala red. --
Naphthalene yellow (Chem.), a yellow dyestuff obtained from certain nitro derivatives of naphthol. [ 1913 Webster ]

a. (Chem.) Pertaining to , or derived from, naphthalene; -- used specifically to designate a yellow crystalline substance, called naphthalenic acid and also hydroxy quinone, and obtained from certain derivatives of naphthol. [ 1913 Webster ]