lab·da·num (lăbdə-nəm) also lad·a·num (lădn-əm)
A resin of certain Mediterranean rockroses of the genus Cistus, yielding a fragrant essential oil used in flavorings and perfumes.
[Middle English, from Medieval Latin lapdanum, labdanum, alteration of Latin lādanum, from Greek lēdanon, lādanon, from lēdon, *lādon, rockrose, of Semitic origin; akin to Old South Arabian ldn, probably a kind of rockrose, and Akkadian ladinnu, ladunu, labdanum; see ldn in the Appendix of Semitic roots.]
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