|abietic acid (ˌæbɪˈɛtɪk)|
|a yellowish powder occurring naturally as a constituent of rosin and used in lacquers, varnishes, and soap. Formula: C19H29COOH; melting pt: 173°C|
|[C19: abietic, from Latin abiēt-, from abiēs silver fir (the acid originally being extracted from the resin)]|
the most abundant of several closely related organic acids that constitute most of rosin, the solid portion of the oleoresin of coniferous trees. Commercial abietic acid is usually a glassy or partly crystalline, yellowish solid that melts at temperatures as low as 85 C (185 F). It belongs to the diterpene group of organic compounds (compounds derived from four isoprene units)
Learn more about abietic acid with a free trial on Britannica.com.