from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A naturally abundant triterpene, commonly isolated from the bark of birch trees, that can be converted to betulinic acid.
from the GNU version of the Collaborative International Dictionary of English
- n. a term originally applied to a substance obtained as a resin or tar by extraction from the outer bark of the common European white birch (Betula alba); now referring to the chemical compound (C30H50O2) having a cyclopentanophenanthrene ring system, which is the main constituent of that extract, and which may be obtained crystalline; -- called also birch camphor.
from The Century Dictionary and Cyclopedia
- n. An alkaloid (C36H60O3) obtained from the bark of the white birch. It crystallizes in the form of long needles, which are fusible and volatile.
Sorry, no etymologies found.