The Collaborative International Dictionary
manna gum
manna gum \manna gum\ n. (Bot.), A tall tree ( Eucalyptus viminalis) yielding a false manna.
Wiktionary
manna gum
n. Any of various eucalyptus trees that exude manna, especially (taxlink Eucalyptus viminalis species noshow=1), found in Australia.
WordNet
manna gum
n. tall tree yielding a false manna [syn: Eucalyptus viminalis]