Definition of tea tree:
(n) :
The tea plant (Camellia sinensis), from which black, green, oolong and white tea are all obtained.
(n) :
The tree Melaleuca alternifolia, from which tea tree oil is obtained.
(n) :
A shrub or small tree native to New Zealand and southeast Australia (Leptospermum scoparium).
(n) :
The kanuka, Kunzea ericoides.
(n) :
The duke of Argyll's tea tree (Lycium barbarum), also known as wolfberry or matrimony vine.
(n) :
The shrub ti (Cordyline fruticosa).