An Etymological Dictionary of Astronomy and Astrophysics

Any long, narrow piece or thing, as a spray of a plant or a strip of cloud; something that streams. → coronal streamer; → helmet streamer

Etymology (EN): M.E. stremer, from → stream + -er.

Etymology (PE): Derafšak, from derafš “flag, banner;” Mid.Pers. drafš “banner;” Av. drafša- “banner;” cf. Skt. drapsá- “flag, banner; drop, spark;” also Fr. drapeau;
It. drappo “flag;” Lith. drapana “dress.”