lab·da·num /ˈlæbdənəm/
  Lab·da·num n. Bot. See Ladanum.
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  Lad·a·num n.  A gum resin gathered from certain Oriental species of Cistus. It has a pungent odor and is chiefly used in making plasters, and for fumigation. [Written also labdanum.]
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  labdanum
       n 1: a dark brown to greenish oleoresin that has a fragrant odor
            and is used as a fixative in perfumes; obtained as a
            juice from certain rockroses [syn: gum labdanum]
       2: a soft blackish-brown resinous exudate from various
          rockroses used in perfumes especially as a fixative [syn:
          ladanum]