Apsaras (Sk.). An Undine or Water-Nymph, from the Paradise or Heaven of Indra. The Apsarases are in popular belief the “wives of the gods” and called Surânganâs, and by a less honourable term, Sumad-âtmajâs or the “daughters of pleasure”, for it is fabled of them that when they appeared at the churning of the Ocean neither Gods (Suras) nor Demons (Asuras) would take them for legitimate wives. Urvasi and several others of them are mentioned in the Vedas. In Occultism they are certain “sleep-producing” aquatic plants, and inferior forces of nature.
Source: H.P.Blavatsky - The Theosophical Glossary