from The Century Dictionary.

  • noun An alkaloid (C36H60O3) obtained from the bark of the white birch. It crystallizes in the form of long needles, which are fusible and volatile.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Chem.) 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 Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun biochemistry A naturally abundant triterpene, commonly isolated from the bark of birch trees, that can be converted to betulinic acid.


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