Definition of "attar"

Now, when orange-flowers are distilled with water, we procure the otto of the blossom, which is known commercially as oil of neroli.

1857, G[eorge] W[illiam] Septimus Piesse, “Section III”, in The Art of Perfumery, and Method of Obtaining the Odors of Plants, […], Philadelphia, Pa.: Lindsay and Blackiston, page 78

I bequeath to you my literary work. Useless though these might be commercially, they are the attar-drops distilled from the long and futile ebullience of my life.

1938, Xavier Herbert, chapter VIII, in Capricornia‎, page 125