n. [ L. ladanum, ledanum, Gr. la`danon, lh`danon, fr. lh^don name of a shrub, mastic; cf. Per. lādan, lāden. 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. ] [ 1913 Webster ]
n. [ Orig. the same wort as ladanum, ladbdanum: cf. F. laudanum, It. laudano, ladano. See Ladanum. ] Tincture of opium, used for various medical purposes. [ 1913 Webster ]
☞ A fluid ounce of American laudanum should contain the soluble matter of one tenth of an ounce avoirdupois of powdered opium with equal parts of alcohol and water. English laudanum should have ten grains less of opium in the fluid ounce. U. S. Disp. [ 1913 Webster ]
Dutchman's laudanum (Bot.) See under Dutchman. [ 1913 Webster ]
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