Lewis Short
maldăcon (noun N) :
* The gum of the tree called bdellium: vicina est Bactriana, in qua bdellium nom inatissimum. Arbor nigra est ... gummi alii brochon appellant, alii malacham, alii maldacon,Plin. 12, 9, 19, § 35.
Charlton T. Lewis, Charles Short, A Latin Dictionary