(countable) A shrub or tree of the tribe Acacieae.

(uncountable, pharmacy) The thickened or dried juice of several species in Acacieae, in particular Vachellia nilotica (syn. Acacia nilotica), the Egyptian acacia.

A false acacia; robinia tree, Robinia pseudoacacia.

(loosely) Any of several related trees, such as the locust tree.

A light to moderate greenish yellow with a hint of red.acacia:

(history, classical studies) A roll or bag, filled with dust, borne by Byzantine emperors, as a memento of mortality. It is represented on medals.