Function: noun
Etymology: from the use of an infusion of their leaves as a beverage
Date: 1790
1 : any of various Australasian shrubs or small trees (genus Leptospermum ) of the myrtle family that form dense thickets and have aromatic evergreen foliage
2 : any of various melaleucas (esp. Melaleuca alternifolia ) with aromatic leaves that yield an essential oil used especially as an antiseptic