ASA, among naturalists. The writers of the later ages have formed this word asa from the lasar of the ancients, and attributed it to a gum very different from that anciently known by the name they have thus corrupted.
The asa of the ancients was an odoriferous and fragrant gum; and the asa of the after-ages had so little title to this epithet, that they distinguished it by one, expressing its being of an offensive or stinking smell. The Arabian writers, according to this distinction, describe two kinds of asa, the one stinking, the other aromatic; and the modern Greeks preserved the name asa, or lasar, to the stinking gum the Latins called by that name, but added a distinctive epithet to express its smell, and called it scardolafarum.
ASA or ASSA, in the materia medica, a name given to two very different substances, called asa-dulcis and asa-fetida.
ASA-DULCIS is the same with BENZOIN.
ASA-FETIDA is the concrete juice of a large umbelliferous plant growing in several parts of Asia; the properties of which are described under the article EX-RULA.