Definition of melaleuca
: any of a genus (Melaleuca) of Australian and southeast Asian trees and shrubs of the myrtle family; especially : cajeput
Medical Definition of melaleuca
1 capitalized : a genus of Australian and southeast Asian trees and shrubs of the myrtle family (Myrtaceae) that includes the cajeput (M. leucadendron)
2: any tree or shrub of the genus Melaleuca
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