LADANUM Meaning of LADANUM in English [ 'lad(ə)nəm ](also labdanum ) ■ noun a gum resin obtained from a rock rose, used in perfumery and for fumigation.OriginC16: via L. from Gk ladanon , lēdanon , from lēdon 'mastic'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004