M.E. washen; O.E. wascan, wæscan; cf. O.N. vaska, M.Du. wasscen, Du. wassen, Ger. waschen, from stem *wat-, the root of → water.
Mid.Pers. šustan, šuy- "to wash;" Av. xšaoδah- "flush of water," xšudra- "liquid, fluid; semen;" cf. Skt. ksod- "to dissolve;" Proto-Ir. *xšaud- "to wash" (Cheung 2007).
Washington Double Star Catalog
kâtâlog-e setâregân-e dotâyi-ye Washington
Fr.: Washington Double Star Catalogue
A stellar catalog which is the world's principal database of astrometric → double star information. It is maintained by the United States Naval Observatory. The WDS Catalog contains positions (J2000), discoverer designations, epochs, position angles, separations, magnitudes, spectral types, proper motions, and, when available, Durchmusterung numbers and notes for the components of 142552 systems (as of Feb 27 2018).