An Etymological Dictionary of Astronomy and Astrophysics

1. Readily distinguishable from all others.
   

   2. Clearly defined; unquestionable (TheFreeDictionary.com).

Etymology (EN): Past-participle adjective from obsolete distincten “to distinguish one thing from another; make distinct,” from O.Fr. distincter, from L. distinctus, p.p. of distinguere “to separate between, mark off.”

Etymology (PE): Bažnâ, literally “high,” from Kurd. bažn “height, stature,” variants baž, baš “height,” bašn, → stature, faš, baš “a horse’s mane.”