a. [ L. ambrosiacus: cf. F. ambrosiaque. ] Having the qualities of ambrosia; delicious. [ R. ]“Ambrosiac odors.” B. Jonson. [ 1913 Webster ]
prop. n. 1. 1 in some classifications considered a separate family comprising a subgroup of the Compositae including the ragweeds. Syn. -- family Ambrosiaceae. [ WordNet 1.5 ]