olibanum
Olibanum (noun) means a resin taken from Boswellia trees; it used to serve as a medicine and today is burnt chiefly as incense.
Etymology
Borrowed from Medieval Latin olibanum, from Latin oleum libani, whose first word means 'oil' and whose second comes from Ancient Greek λίβανος (líbanos, 'frankincense (Boswellia sacra)'), from a Semitic source; compare Proto-Semitic *laban- ('white'). It is cognate with Biblical Hebrew לְבוֹנָה (l'voná, 'frankincense') and Arabic لبان (lubān, 'frankincense'). (Compare benzoin for a similar process of metanalysis.) It is a doublet of oliban.