yellow gum

Short definition from Wiktionary

Noun

1. 1
   Any of various plants which produce a yellow resin, some of which are used medicinally: Any of various plants of eastern Australia, especially Xanthorrhoea resinosa and Eucalyptus leucoxylon; also (obsolete) the resin itself.
2. 2
   Any of various plants which produce a yellow resin, some of which are used medicinally: Trees of genus Nyssa, of North America and Asia.
3. 3
   Melena or black jaundice in infants.