Naphthalene
in chemistry, C10HS= C10H,H, naphthalin, or naphthaline. A frequent product of the dry distillation of organic substances, occurring to a considerable extent in that portion of coal-tar distilling between 180° and 220°, from which it crystallizes on cooling. It forms colorless shining, leafy crystals of peculiar odor and burning NAPIER taste; melts at 79° to a liquid as clear as water; boils at 216°-220°, and burns, when inflamed, with a highly luminous but smoky flame.