1. a viscous, dark residue consisting of many organic compounds, mainly hydrocarbons, obtained by the distillation of tar 2. construction the ratio of the rise of a roof relative to its span 3. utilization in a saw having teeth of a uniform type, the distance (circumferential for circular saws and linear for others) between the points of teeth of similar type 4. wood —see natural resin, naval storesThis definition last updated 07/24/2008