Sandalwood n. : The highly perfumed yellowish heartwood of an East Indian and Polynesian tree (Santalum album), and of several other trees of the same genus, as the Hawaiian Santalum Freycinetianum and S. pyrularium, the Australian S. latifolium, etc. The name is extended to several other kinds of fragrant wood.

Sandalwood n. : Any tree of the genus Santalum, or a tree which yields sandalwood.

Sandalwood n. : The red wood of a kind of buckthorn, used in Russia for dyeing leather (Rhamnus Dahuricus).

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Taxonomy
Sandalwood, trees, Indian sandalwood, sandalwood trees, sandalwood oil, oil, species, true sandalwood, Santalum, Santalum album, wood, free encyclopedia, essential oil, genus santalum, scents, ceremonies, Fragrance, perfume.

Defination from the web:
sandalwood, is currently a threatened species and consequently very expensive. ... Sandalwood essential oil prices have risen up to $1000–1500 per kg in the last 5 years. ...