noun.
A genus of shrubby or arboreous plants, natural order Leguminosæ, suborder Mimoseæ, natives of the warm regions of both hemispheres, especially of Australia and Africa.
noun.
A plant of the genus Acacia.
noun.
The popular name of several plants of other genera.
noun.
In medicine, the inspissated juice of several species of Acacia, popularly known as gum arabic (which see, under gum). A name given by antiquaries to an object resembling a roll of cloth, seen in the hands of consuls and emperors of the Lower Empire as represented on medals.