Lad"a*num (?), n. [L. ladanum, ledanum, Fr. (), (), fr. name of a shrub, mastic; cf. Per. ladan, laden. Cf. Laudanum.]
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
© Webster 1913.